Upside Down U Meaning In Math

Upside Down U Meaning In MathThe symbol is an upside down U like this: ∩ Example: The intersection of the "Soccer" and "Tennis" sets is just casey and drew (only casey and drew are in both sets), which can be written: Soccer ∩ Tennis = {casey, drew} Try asking each person "do you go to Soccer and also Tennis?. The upside-down U in math is commonly known as an intersection between two or more sets, which is the collection of common elements of all the sets. This is a symbol for product similarly as ∑ ∑ for sum. It originated in the Phoenician consonant symbol waw, the common ancestor of the letters F, U, V, W, Y. like what is common in both sets What does an upside down u mean in math? It is used in set theory. Limit Jan 19, 2010 Jan 19, 2010 #1 Char. Delta has many uses in mathematics. what does U mean? And that upside down? Guest Sep 3, 2014 Best Answer #3 +33440 +5 This is set notation. What does the upside down U symbol mean in math? In sets it means intersects. Symbol Symbol Name Meaning / definition Example; limit: limit value of a function :. com/_ylt=AwrFecdF9V5kVNEPZPRXNyoA;_ylu=Y29sbwNiZjEEcG9zAzMEdnRpZAMEc2VjA3Ny/RV=2/RE=1683973574/RO=10/RU=https%3a%2f%2fwww. Upside down, backwards letters and symbols">Upside down, backwards letters and symbols. " f(x) ↓ 0 f ( x) ↓ 0 " means that f(x) f ( x) is going to 0 0 from above, for example if f(x) =x2 f ( x) = x 2 and you're taking limit x x to 0 0 then f(x) ↓ 0 f ( x) ↓ 0 (because f(x) f ( x) is never negative). In math what does the upside down you thing mean? In set theory, a "U" stands for union. What is the U and upside down U in math?. Calculus symbols list (ε, y', d/dx , ∫). The intersection of two sets is a new set that includes only the elements that are common to both of the original sets. The upside-down U in math is commonly known as an intersection between two or more sets, which is the collection of common elements of all the sets. The name comes from the glyph's resemblance to an old fashioned harp. Arrow (symbol) and Miscellaneous Symbols and Arrows and arrow symbols. the intersection of { p a n s y }. What does the $\\prod$ symbol mean?. List of mathematical symbols. Exploring Logic Symbols: Meaning of Upside-down A, V, and U Char. A universal set (usually denoted by U) is a set which has elements of all the related sets, without any repetition of elements. The uppercase Pi ∏ ∏ symbol stands for the product p r o d u c t operator throughout mathematics, just as the uppercase Sigma ∑ ∑ symbol would describe the sum operator. What Does An Upside Down Horseshoe Mean In Math? Published by Henry Stone on November 28, 2022. it used to have their photo and now is question mark? Was this answer helpful? Yes | No Comment Reply Report karl528 Level 10 (Genius). The following table summarizes the. If an element is in just one set it is not part of the intersection. In math, what is the upside down U? The upside-down U in mathematics refers to the intersection of sets. The Venn Diagram is now like this: Union of 3 Sets: S ∪ T ∪ V. The uppercase Pi ∏ ∏ symbol stands for the product p r o d u c t operator throughout mathematics, just as the uppercase Sigma ∑ ∑ symbol would describe the sum operator. "Intersection" is when you must be in BOTH sets. 4 is less than 5. What does an upside down u mean in math?. In maths, the upside-down U means intersection of sets. Upside down question mark mean maths Anonymous 1 0 Means they havent supplied a current photo, or deleted the old photo. ) As others noted, it means that the stated assertions holds "for all instances" of the given variable (here, s ). The upside-down U in math is commonly known as an intersection between two or more sets, which is the collection of common elements of all the sets. If the events A and B are independent, P (A|B)=P (A), the outcome of B does not influence the outcome of A, so the probability of A occurring doesn. In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets. The upside-down A symbol is the universal quantifier from predicate logic. And by definition we have P ( A ∣ B) = P ( A ∩ B) P (. this big V big upside down V notation is used because it shows the link between the quantifiers. Now if you want to know what this actually signifies then let’s suppose you have two collection of colors ; Collection A : Red,Green,Orange, Violet & Collection B : Green, Orange, Blue, Yellow. Upside down “ U “ in math is symbol for intersection which basically comes under Set Theory. Union Definition (Illustrated Mathematics Dictionary)">Union Definition (Illustrated Mathematics Dictionary). The ∀ symbol may look like the familiar capital “A” written upside down, but in mathematics (specifically in predicate calculus), the ∀ is a logic symbol or universal quantifier. ISO 31-11 (Mathematical signs and symbols for use in physical sciences and technology) Number Forms. See also Convective Derivative, Curl, Divergence, Gradient , Laplacian, Nabla, Vector Derivative, Vector Laplacian Explore with Wolfram|Alpha. In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets. Upside Down Y Symbol Upside Down Y Symbol Information, easy-to-copy variants, customizer, and more. com">Math Symbols List (+,. The following table summarizes the names and notations for various vector derivatives. Set A is {1, 2, 3}, and set B is {2, 3, 4}. It is preceded by λ and followed by ν. It was first used in this way by Gerhard Gentzen in 1935, by analogy with Giuseppe Peano 's turned E notation for existential quantification and the later use of Peano's notation by Bertrand Russell. jade plays Tennis and Volleyball. the intersection of { p a n s y } and { p r i m u l a } is { p a } In a Venn diagram (a graphical representation of sets) it is the overlap of two shapes. The symbol ∩ is used to denote an intersection between two sets. In math, the upside-down symbol “U” is used to represent the intersection of two sets. it's similar for and the big V. Hence, the union of two sets P and Q will be the set of elements in P and Q. So the minimum function is the most plausible interpretation I can think of. What does the upside down U mean in interval notation? Union. How to remember what |, U, ∩ stand for. List of mathematical symbols by subject. It is used to represent universal quantification in predicate logic, where it is typically read as "for all". For example, let's say we have two sets, A and B. V means the set of Volleyball players. Mathematical Operators and Supplemental Mathematical Operators. The upside-down capital delta symbol , also called "nabla" used to denote the gradient and other vector derivatives. Math can be a confusing subject for many people, but one thing that can be particularly confusing is when we use certain symbols in equations and formulas. What is the upside down U in probability? – TipsFolder. Upside down text generator - flip dᴉʅⅎ Aboqe generator is a tool that can flip your text upside down by utilising special letters, symbols and characters. probability wise upside down ' U ' stands (A∩B) for A intersection of B means elements from both sets indicates are common from set A as well as set B. A set is a collection of things, usually numbers. The special symbol for Intersection is an upside down "U" like this: ∩ And this is how we write it: Soccer ∩ Tennis = {casey, drew} In a Venn Diagram: Venn Diagram: Intersection of 2 Sets Which Way Does That "U" Go?. The uppercase Pi ∏ ∏ symbol stands for the product p r o d u c t operator throughout mathematics, just as the uppercase Sigma ∑ ∑ symbol would describe the sum operator. In math, the upside-down symbol “U” is used to represent the intersection of two sets. If it's upside down, it's called del. The Intersection symbol is an upside down "U" like this: ∩ Example: (-∞, 6] ∩ (1, ∞) The first interval goes up to (and including) 6 The second interval goes from (but not including) 1 onwards. The special symbol used to denote the set is ∪ that looks like "U". P (A|B) is conditional probability. equal probability in range a,b. The union is the entire area of both circles. Calculus & analysis math symbols table. U = {alex, blair, casey, drew, erin, francis, glen, hunter, ira, jade} We can show the Universal Set in a Venn Diagram by putting a box around the whole thing: Now you can see ALL. 1 is the conjunction. The intersection of two sets is a new set that includes only the elements that. like what is common in both sets What does an upside down u mean in math? It is used in set theory. (Also see the more complete discussion of the first-order predicate calculus. This is used in set theory to refer to those members of two sets which are common to both. Lowercase Delta kind of looks like a cherry. There are three usual meanings of the wedge ( ∧ ∧) symbol: logical conjunction, some sort of "wedge product" and the minimum function. The symbol for intersection is an upside-down. Math can be a confusing subject for many people, but one thing that can be particularly confusing is when we use certain symbols in equations and formulas. The Greeks adopted waw as upsilon (γ, lower case υ), which the Romans took from the Etruscans as V view details ›. For example, depending on context, the triple bar "≡" may represent congruence or a definition. What does the upside down U symbol mean in math? In sets it means intersects. Think of the following analogy alliteration: P i is to a P roduct as S igma is to a S um. upside down U symbol in math? – QnA Pages">What is the upside down U symbol in math? – QnA Pages. What is the upside down U symbol in math? (2023). For example, if we are given Set A $= { Red, Yellow, Blue}$ and Set B $= { Pink, Yellow, Green}$ then the intersection between these two sets Set A and Set B will be $= {Yellow}$. The intersection of two sets, A and B, is the set of all elements that are in A as well as in. What is the upside down U symbol in math? – QnA Pages. But certainly, you should look at the. Share Cite answered Mar 16, 2019 at 15:12 Marvin 518 1 3 8 Add a comment 1. The ∀ symbol may look like the familiar capital “A” written upside down, but in mathematics (specifically in predicate calculus), the ∀ is a logic symbol or universal quantifier. A ∪ U = U All the elements of set A are inside the circle. "Intersection" is when you must be in BOTH sets. these symbols are used by some authors because saying is equivalent to. In math what does the upside down you thing mean? In set theory, a "U" stands for union. T means the set of Tennis players. It is used to represent universal quantification in predicate logic, where it is typically read as "for all". For example: A ∪ B means everything in A and B; A ∩ B means the things that are common to A and B. The upside-down U in math is commonly known as an intersection between two or more sets, which is the collection of common elements of all the sets. This means that ∀ is a shorthand character you’ll use when writing proofs, equations, and sets. The Intersection (or overlap) of those two sets goes from 1 to 6 (not including 1, including 6): (1, 6] Conclusion. So A cap B is the set of all elements common to A and B. What is the upside down U in probability? It is mostly used in set notation which means INTERSECTION. So the union of sets A and B is the set of elements in A, or B, or both. S means the set of Soccer players. What does the upside down 'v' mean in math? Provide an. What is μ in math? μ = ( Σ X i. Math can be a confusing subject for many people, but one thing that can be particularly confusing is when we use certain symbols in equations and formulas. What does an upside down u mean in math? It is used in set theory to indicate intersection. The upside down 'v' used in the problem is called caret, and represents exponent, literally 'raised to power'. If it's upside down, it's called del. The set made by combining the elements of two sets. What does the upside down U symbol mean in math? In sets it means intersects. In math what does the upside down U mean?. The intersection of two sets A and B, denoted by A B, is the set that contains all elements of A that belong to B (or equivalently, all elements of B that belong. Given two sets S and T, S ∩ T is used to denote the set {x|x ∈ S and x ∈ T}. The upside-down capital delta symbol del , also called "nabla" used to denote the gradient and other vector derivatives. Universal Set Symbol & Examples. What does a B mean? Probability wise upside down ‘U’ stands (A) for A intersection of B means that elements from both sets indicate that they are common from both set A and set B. What does ∩ mean in math? intersection ∩. Limit Gold Member 1,216 22 A lot of times, when I look at something written in logic, there are these strange symbols popping out everywhere. The Unicode numeric entity codes can be expressed as either decimal numbers or. Upside Down Uppercase "Y": ⅄ Upside Down Lowercase "y": ʎ Example: ⅄O⅂O Table of contents: Copy and Paste (2 symbols) Customize 📋 Upside Down Y Text Symbols to Copy and Paste There are 2 symbols. It is a popular convention used to See full answer below. / Text Symbols / Upside Down Y Symbol Upside Down Y Symbol Information, easy-to-copy variants, customizer, and more. What does ∩ mean in math? intersection ∩ The symbol ∩ means intersection. The Greeks adopted waw as upsilon (γ, lower case υ), which the Romans took from the Etruscans as V. What does an upside down u mean in math? It is used in set theory to indicate intersection. What is the U symbol in math? In math, the. So, if A = the set of all round objects and B = the set of all green objects, then A cap B is the set of all round green objects. what does ∇ (upside down triangle) symbol mean in this problem Ask Question Asked 12 years, 7 months ago Modified 2 years ago Viewed 254k times 39 Given f ( x) = 1 2 x T A x + b T x + α where A is an nxn symmetric matrix, b is an n-dimensional vector, and alpha a scalar. So, one of the conditions for the manipulation of functions that is described in your textbook is that x∈D (f)∩D (g). What is an upside down U in math? Aug 5, 2019 The intersection of two sets are all the elements that appear in both sets. What is upside down U in math? – Global Answers. Meaning of the Upside down U Symbol? : …. The set made by combining the elements of two sets. How Many Mathematical Symbols are there? There are more than 10000 math symbols. U, u [Called 'you']. For many of the symbols below, the symbol is usually synonymous with the corresponding concept (ultimately an arbitrary choice made as a result of the cumulative history of mathematics), but in some situations, a different convention may be used. Math is Fun">Sets and Venn Diagrams. Calculus and analysis math symbols and definitions. What is the U symbol in math? In math, the symbol U represents. The symbol for denoting a conditional probability. What Does U And Upside Down U Mean In Math? (Answered). In math, what is the upside down U? The upside-down U in mathematics refers to the intersection of sets. A ∪ U = U All the elements of set A are inside the circle. In maths, the upside-down U means intersection of sets. A universal set (usually denoted by U) is a set which has elements of all the related sets, without any repetition of elements. In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets. The upside-down capital delta symbol , also called "nabla" used to denote the gradient and other vector derivatives. " This means that ∀ is a shorthand character you'll use when writing proofs, equations, and sets. You'll soon run into its sibling, the backwards capital E, which is the existential quantifier, meaning "there exists at least one. In math, the upside-down symbol "U" is used to represent the intersection of two sets. What is the upside down U symbol in math? – Foley for Senate. This set will contain all elements of A that also belong to B (or equivalently, all elements of B that also belong to A). Translingual: ·(statistics) population mean· (physics) coefficient of friction· (physics) magnetic permeability (physics) muon (dated, physics) micron, micrometre·Lower-case mu (μῦ), the 12th letter of the ancient Greek alphabet. What does this symbol mean ∩? ∩ The symbol ∩ means intersection. What does the upside down 'U' mean in math?. this big V big upside down V notation is used because it shows the link between the quantifiers. The intersection is where the circles overlap. html/RK=2/RS=6PVY6ACn578XxtzgOEZvwlYfEl0-" referrerpolicy="origin" target="_blank">See full list on mathsisfun. We can list each element (or "member") of a set inside curly brackets like this: Common Symbols Used in Set Theory. Miscellaneous Math Symbols: A, B, Technical. The ∀ symbol may look like the familiar capital “A” written upside down, but in mathematics (specifically in predicate calculus), the ∀ is a logic symbol or universal. Let's say you have two sets: A = {1,2,3,4} B = {3,4,7,8} then, A ∩ B = {3,4} A U B = {1,2,3,4,7,8}. It can also denote other things in other contexts (wedge products, exterior products, for example). like what is common in both sets What does the upside down e mean in the dictionary? It means a vowel. Upside down, backwards letters and symbols. U, u [Called 'you']. What does upside down "v" ($\\wedge$) mean in this equation?. What does ∩ mean in math? intersection The intersection of a set A with a B is the set of elements that are in both set A and B. What exactly does the word “texting” mean? So don’t thank us if (U) means “Heartbroken. So, if A = the set of all round objects and B. Greek Letters in Mathematics. In math what does the upside down you thing mean? In set theory, a "U" stands for union. upside down question mark mean in math?. also, since they're not mentioned there: the giant V is an equivalent notation for and the upside down giant V is an equivalent notation for. Probability and statistics symbols table and definitions - expectation, variance, standard. com">What is the upside down U in probability?. The symbol is an upside down U like this: ∩. The symbol is a special "U" like this: ∪. U means union and can be thought of as the word or. You can use it in place of "for all. What is U and upside down U in math? In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets. What is an upside down U in math?Aug 5, 2019The intersection of two sets are all the elements that appear in both sets. The ∀ symbol may look like the familiar capital “A” written upside down, but in mathematics (specifically in predicate calculus), the ∀ is a logic symbol or universal quantifier. “Union” is represented by a right-side up U. What does ∪ mean in math? The union of a set A with a B is the set of elements that are in either set A or B. Statistical symbols & probability symbols (μ,σ,). What is the upside down U in probability? It is mostly used in set notation which means INTERSECTION. Upside down ‘U’ i. Show that x f ( x) = A x + b and H = x 2 f ( x) = A. They mean a one sided limit. The 21st LETTER of the Roman ALPHABET as used for English. Calculus & analysis math symbols table. In maths, the upside-down U means intersection of sets. It’s frequently referred to as ‘cap. The special symbol for Intersection is an upside down "U" like this: ∩ And this is how we write it: Soccer ∩ Tennis = {casey, drew} In a Venn Diagram: Venn Diagram: Intersection of 2 Sets Which Way Does That "U" Go?. What does the upside down U mean in Venn diagrams? The circles A and B represent sets. What is U and upside down U in math? In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets. It originated in the Phoenician consonant symbol waw, the common ancestor of the letters F, U, V, W, Y. what does ∇ (upside down triangle) symbol mean in this problem. Also, they are part of the big rectangle which makes them the elements of set U. ’ As a result, A cap B is the common set of all elements. “Intersect” is represented by an upside down U. Think of lowercase O with a stem on top. Calculus and analysis math symbols and definitions. Upside Down Uppercase "Y": ⅄ Upside Down Lowercase "y": ʎ Example: ⅄O⅂O Table of contents: Copy and Paste (2 symbols) Customize 📋 Upside Down Y Text Symbols to Copy and Paste There are 2 symbols. Statistics P(ANB) and P(AUB) and P(A. symbol vector derivative del gradient del ^2 Laplacian or vector Laplacian del _(u) or s^^·del directional derivative del · divergence del × curl partial/(partialt)+v·del convective. ∪ means union, ∩ means intersection. If an element is in just one set it is not part of the intersection. List of mathematical symbols. upside down 'v' mean in math? Provide an ">What does the upside down 'v' mean in math? Provide an. Upside Down Y Symbol Upside Down Y Symbol Information, easy-to-copy variants, customizer, and more. U = {alex, blair, casey, drew, erin, francis, glen, hunter, ira, jade} We can show the Universal Set in a Venn Diagram by putting a box around the whole thing: Now you can see ALL your ten best friends, neatly sorted into what sport they play (or not!). ” This means that ∀ is a shorthand character you’ll use when writing proofs, equations, and sets. For example, let’s say we have two sets, A and B. What is the meaning of a notation of upward or downward arrow in Math?. What does U mean in probability?. The Unicode numeric entity codes can be expressed as either decimal numbers or. The upside-down capital delta symbol del , also called "nabla" used to denote the gradient and other vector derivatives. what does U mean? And that upside down? Guest Sep 3, 2014 Best Answer #3 +33440 +5 This is set notation. Exploring Logic Symbols: Meaning of Upside-down A, V, and U Char. What this means in general is, for any two sets A and B, A∩B is the distinct values of A that are also present in B. Upside down ‘U’ i. The symbol ∩ is used to denote an intersection between two sets. In maths, the upside-down U means intersection of sets. Example: Soccer = {alex, hunter, casey, drew} Tennis = {casey, drew, jade} Soccer ∪ Tennis = {alex, hunter, casey, drew, jade} In words: the union of the "Soccer" and "Tennis. Some of the common arithmetic math symbols are: plus sign (+) used for addition, minus sign (-) used for subtraction, asterisk sign (*) or times sign ( ×) used for multiplication, and division sign (÷) or slash sign (/) used for division. Calculus and analysis math symbols and definitions. The ∀ symbol may look like the familiar capital "A" written upside down, but in mathematics (specifically in predicate calculus), the ∀ is a logic symbol or universal quantifier. For example {1,2,3}∩ {3,4,5} = {3}. What does ∩ mean in math? intersection ∩ The symbol ∩ means intersection. The letter “Ø” is sometimes used in mathematics as a replacement for the symbol “∅” (Unicode character U+2205), referring to the empty set as established by. Probability and statistics symbols table and definitions - expectation, variance, standard deviation, distribution, probability function, conditional probability, covariance, correlation. In set theory, a "U" stands for union. Mathematical Operators and Supplemental Mathematical Operators. What Does U And Upside Down U Mean?. If it's upside down, it's called del. The upside-down capital delta symbol , also called "nabla" used to denote the gradient and other vector derivatives. A U B means objects that belong to set A or set BThe upside-down "U" (which I'm not going to be able to print here) stands for intersection, objects. That's based off of the Greek letter. Meaning of the Upside down U Symbol? : r/cheatatmathhomework. The symbol means remove from a set. the intersection of { p a n s y } and { p r i m u l a } is { p a } In a Venn diagram (a graphical representation of sets) it is the overlap of two shapes. The uppercase Pi ∏ ∏ symbol stands for the product p r o d u c t operator throughout mathematics, just as the uppercase Sigma ∑ ∑ symbol would describe the sum operator. What does the upside down U symbol mean in math?. com">Calculus symbols list (ε, y', d/dx , ∫). The following reference list documents some of the most notable symbols in these two topics, along with each symbol’s usage and meaning. More on this: What Hats Are Best For Small Heads? What is the meaning of reversed U? The Inverted-U Theory illustrates the relationship between pressure and performance. Mathematical Symbols » Probability and Statistics Symbols robability and statistics correspond to the mathematical study of chance and data, respectively. In math, the symbol U represents the union of two sets, while upside-down U represents the intersection of the sets see more › (Video) Intersection and union of sets | Probability and Statistics | Khan Academy (Khan Academy) What is the sideways U in math? That sideways-U thing is the subset symbol, and is pronounced "is a subset of". More on this: When Did The Fedora Hat Go Out Of Style?. Strictly speaking, nabla is the name of the typographical glyph, the upside down triangle: just a symbol on paper, meaning whatever the author intends it to mean. You've seen uppercase Delta before in your Algebra 1 classes. Note: be careful with inequalities like that one. A U B means objects that belong to set A or set BThe upside-down "U". 5 ≥ 4, x ≥ y means x is greater than or equal to y. Upside down question mark mean maths Anonymous 1 0 Means they havent supplied a current photo, or deleted the old photo. Symbol Symbol Name Meaning / definition Example; limit: limit value of a. 2 It is quite common to write Where have you found it? Are this boolens, numbers or what? May 30, 2019 at 14:48 Add a comment 2 Answers Sorted by: 2 It is very common for ∧ to be used when one considers differential k -forms. upside down U mean in algebra?. Examples include an upside-down A, a giant V or U, or an upside-down V. You can see (for example) that: drew plays Soccer, Tennis and Volleyball. The symbol for intersection is an. In math, the upside-down symbol “U” is used to represent the intersection of two sets. What does the upside down U mean in algebra?. You can use it in place of “for all. In math what does the upside down n mean?. In math what does the upside down U mean? Intersection. What is the upside down U in probability?. Uppercase Delta looks like an triangle. For instance, the decimal version of the therefore symbol (∴) would be &‌#8756; The hexadecimal version of the therefore symbol (∴) would be &‌#x2234; Note that the hexadecimal numbers include x as part of the code. What does U mean in probability? U(a,b) uniform distribution. upside down u mean in math?. On the number line it looks like this: And interval notation looks like this: (-∞, 2] U (3, +∞) We used a “U” to mean Union (the joining together of two sets). What this means in general is, for any two sets A and B, A∩B is the distinct values of A that are also present in B. U And Upside Down U Mean?. What is an upside down U in math?Aug 5, 2019The intersection of two sets are all the elements that appear in both sets. The upside down 'v' used in the problem is called caret, and represents exponent, literally 'raised to power'. The math symbol U is used to denote the set made by combining the elements of two sets. Say if A and B are two sets, such as A = {1,2,3} and B = {1,a,b,c}, then the universal set associated with these two sets is given by U = {1,2,3,a,b,c}. The upside-down A symbol is the universal quantifier from predicate logic. Departing a little from the other very good answers here. what does ∇ (upside down triangle) symbol mean in this problem Ask Question Asked 12 years, 7 months ago Modified 2 years ago Viewed 254k times 39 Given f ( x) = 1 2 x T A. also, since they're not mentioned there: the giant V is an equivalent notation for and the upside down giant V is an equivalent notation for. It represented the bilabial nasal /m/. In math what does the upside down U mean? Intersection. Set Symbols. Think of the following analogy alliteration: P i is to a P roduct as S igma is to a S um. upside down U symbol mean in math?. P ( A ∣ B) is the probability of event A occurring given that we have knowledge that B has occurred. ” YW! What does the word “U” mean?. Alan Sep 3, 2014 3 +2 Answers #1 +4473 +5 This website will provide some helpful details:. The uppercase Pi ∏ ∏ symbol stands for the product p r o d u c t operator throughout mathematics, just as the uppercase Sigma ∑ ∑ symbol would describe the sum operator. What does an upside down question mark mean in math?. As both |xi| | x i | and t t are scalars, we can rule out the first two possibilities. e, ‘∩’ means the intersection between two sets. source: I do not know what it means the question mark next to my friend`s contact name. Venn Diagrams of Set operations In set theory, there are many operations performed on sets, such as: Union of Set Intersection of set Complement of set Difference of set etc. For example, if we are given Set A = R e d, Y e l l o w, B l u e and Set B = P i n k, Y e l l o w, G r e e n then the intersection between these two sets Set A and Set B will be = Y e l l o w. For example, if we are given Set A $= { Red, Yellow, Blue}$ and Set B $= { Pink, Yellow,.