 # Quick Answer: What Does The U And Upside Down U Mean?

## What is a ∆ B?

A∆B which is called the symmetric difference between A and B is defined as (A-B)U(B-A).

Now, A-B is the set of all elements which are in A but not in B.

So, A – B = {1,2}.

Similarly, B-A is the set of all elements which are in B but not in A..

## What does R mean in math?

real numbersList of Mathematical Symbols • R = real numbers, Z = integers, N=natural numbers, Q = rational numbers, P = irrational numbers. Page 1. List of Mathematical Symbols. • R = real numbers, Z = integers, N=natural numbers, Q = rational numbers, P = irrational numbers.

## Is 0 a real number?

Real numbers consist of zero (0), the positive and negative integers (-3, -1, 2, 4), and all the fractional and decimal values in between (0.4, 3.1415927, 1/2). Real numbers are divided into rational and irrational numbers.

## What is an empty or null set?

In set theory the concept of an empty set or null set is very important and interesting. Its definition is as follows: “a set which contains no elements is called as empty set or null set”, and it is sometimes known as void set or vacuous set.

## What does the U mean in probability?

The probability that Events A and B both occur is the probability of the intersection of A and B. … If Events A and B are mutually exclusive, P(A ∩ B) = 0. The probability that Events A or B occur is the probability of the union of A and B. The probability of the union of Events A and B is denoted by P(A ∪ B) .

## What does AB mean in sets?

The difference of set B from set A, denoted by A-B, is the set of all the elements of set A that are not in set B. In mathematical term, A-B = { x: x∈A and x∉B} If (A∩B) is the intersection between two sets A and B then, A-B = A – (A∩B)

## What does ∩ mean in math?

In mathematics, the intersection of two sets A and B, denoted by A ∩ B, is the set containing all elements of A that also belong to B (or equivalently, all elements of B that also belong to A).

## What does a B mean in math?

here, a|b means a divides b.. but in some cases like…. In probability theory, a|b means a given b. i.e. P(a|b) is the probability of event a given b happened.

## What are the 4 operations of sets?

Set Operationsunion of sets.intersection of sets.difference of sets.complement of set.ordered pair, ordered n-tuple.equality of ordered n-tuples.Cartesian product of sets.

## What does C mean in sets?

complementIt means complement. For example, Let A be a set of even numbers less than 10 then the contents of this set will be {2,4,6,8} but for A^c i.e. complement of would have contents {1,3,5,7,9}.

## What does an upside down U mean in Venn diagrams?

The circles A and B represent sets. “Intersect” is represented by an upside down U. The intersection is where the circles overlap. “Union” is represented by a right-side up U. The union is the entire area of both circles.

## What is a ∆ B in sets?

Let A and B are two sets. The symmetric difference of two sets A and B is the set (A – B) ∪ (B – A) and is denoted by A △ B. … A △ B is the set of all those elements which belongs either to A or to B but not to both.

## What does grade u mean?

unsatisfactoryThe letter grades equivalent to “U” (unsatisfactory) are “C-,” “D+,” “D,” and “F”. Students who have opted for S/U grading and earn a “C-,” “D+” or “D” may recover the letter grade if they wish to use the course toward degree requirements.

## What does R mean?

Simply put, the (R) symbol next to a trademark means that the trademark is officially registered with the US Patent & Trademark Office (or USPTO for short). For a simple, arbitrary, non-existing word mark, it can be easy and inexpensive to register your trademark by yourself.

## What is the U symbol in stats?

The symbol ‘μ’ represents the population mean. The symbol ‘Σ Xi’ represents the sum of all scores present in the population (say, in this case) X1 X2 X3 and so on. The symbol ‘N’ represents the total number of individuals or cases in the population.

## What does this mean ∑?

in mathematics, this symbol means summation (capital Greek symbol) is the addition of a sequence of numbers; the result is the sum of the total. if numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation. Source: Wikipedia.

## What does C stand for in probability?

P(AB) means the probability that events A and B occur. You could write it P(A∩B). The superscript c means “complement” and Ac means all outcomes not in A. So, P(AcB) means the probability that not-A and B both occur, etc.

## What does the U mean in math?

union of sets AThe set made by combining the elements of two sets. So the union of sets A and B is the set of elements in A, or B, or both. The symbol is a special “U” like this: ∪ Example: Soccer = {alex, hunter, casey, drew}