Is Math Logic what does A' stand for when A={1,2,3,4}.?

Question

I am so confused on my logic homework right now. Any help would be appreciated.

lease note the apostraphe next to the first A. I forget what it means and can not find it in the online book.

Answer 1

It has nothing to do with math logic.
A is the name of a set that contains the elements 1, 2, 3, and 4.

Answer 2

There has to be more to the homework than that. As stated, all your other answers are correct. A is a symbol denoting the set {1,2,3,4}

Usually a homework page will include a number of sets, then ask you for the unions and intersections between them. I suspect that that is what the homework is about.

If there is also a set B = {1,3,5,7}

A U B = {1,2,3,4,5,7} or all the elements in both sets counted once ie - not {1,1,2,3,3,4,5,7}

A intersection B (upside down U) is {1,3} or the elements common to both sets.

Answer 3

A is a set containing elements 1,2,3,4

A' is a complementary set of A
means A = U - A ( U minus A )
here U is an universal set(universal set means it contains all the elements in consideration and every other set would b its subset) that should b defined in the question
for eg
if i take U = { 1,2,3,4,5,6,7,8,9,10}
then A' = {1,2,3,4,5,6,7,8,9,10} - {1,2,3,4} = {5,6,7,8,9,10}

Answer 4

A' usually (in set theory or logic) stands for the complement of A so A' means everything that is NOT in A. Unfortunately this notation is not universal so your teacher might be using it to mean something else.

Answer 5

To start off {1,2,3,4} means a set which consists of the four integers inside the "{ }". We can set this equal to anything for purposes of a shortened version. So we set it equal to A. Ayyy!!!

Answer 6

A appears to be the NAME of the SET {1,2,3,4}