How

Math to solve problems.


To put it simply, imagine playing a game with set dice. You know you will always get two threes, so with a certainty you can say that based on your first eleven rolls of threes your next roll will both be three.

Crossroad provides a constant network of help when needed, in doing this--the military (Past or Present) maintains contact with another alumni of Veterans Treatment Court, San Diego.  

A

1.2.2 Set Operations
The union of two sets is a set containing all elements that are in A or in B (possibly both). For example, {1,2}∪{2,3}={1,2,3}. Thus, we can write x∈(A∪B) if and only if (x∈A) or (x∈B). Note that A∪B=B∪A., the union of sets A and B is shown by the shaded area in the Venn diagram. (located on the homepage)

B
Similarly we can define the union of three or more sets. In particular, if A1,A2,A3,⋯,An are n sets, their union A1∪A2∪A3⋯∪An is a set containing all elements that are in at least one of the sets. We can write this union more compactly by
⋃i=1nAi.

For example, if A1={a,b,c},A2={c,h},A3={a,d}, then ⋃iAi=A1∪A2∪A3={a,b,c,h,d}. We can similarly define the union of infinitely many sets A1∪A2∪A3∪⋯.

The intersection of two sets A and B, denoted by A∩B, consists of all elements that are both in A and−−− B. For example, {1,2}∩{2,3}={2}. the intersection of sets A and B is shown by the shaded area using a Venn diagram.  (located on the homepage)

More generally, for sets A1,A2,A3,⋯, their intersection ⋂iAi is defined as the set consisting of the elements that are in all Ai's. 

In keeping a constant positive input to the alumni, Crossroad will that thanks to our Partners and all volunteer staff.
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