### Venn diagrams

Today we discuss about Venn Diagrams and how they were originally called Eulers circles. Then we started talking about how 6 is the first perfect number. Then we talked about how Euler had 11 children. But Sadly only 5 survive because of all the deceases back then. So anyways we started to take notes about sets.

set: a collection of objects may be things, people, numbers, etc....

subset: a "smaller" collection of objects taken from a given set.

universe: the set of all objects being considered.

null set: (A.K.A. the empty set) the empty set (it's got nothing in it) is a subset of every set. It is written as {O}.

operation on sets:

union (U) aUb means gather all the objects in set A with all the objects in set B.

Union(U) means "or".

Compliment: (A') means everything that is outside set A

compliment (A') means "not".

exclusion(/) a/b means everything that is in set A excluding those things that are also in set B

exclusion(/) means excluding.

Intersection A (upside down U) B means gather all the objects that are in both set A and B

intersection A(upside down U) B

After we wrote in our dictionaries we had a worksheet that we worked on. Mr. K. gave us the answers for #1. By the way the answer to the second worksheet for #1 e) is wrong it should be (e,u) not (a).

The next scribe is............................

## 1 Comments:

A great first scribe Robinna!

BTW, Euler had 13 children, not 11 and the null set is not {0} (don't use a zero) it is {φ}. That's the greek letter phi. In order to get it to show up on your post write &PHI; (but don't use capital letters, use the lowercase letters phi.) It HAS to start with this & (shift-7) and end with a semicolon (;).

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