Elements, subsets, and set equality (Screencast 2.3.3)

This video introduces terminology and notation for elements belonging to sets, what it means for a set to be a subset of another set, and what it means for two sets to be equal.

[farheenyousuf]

Thanks for the wonderful explanation 👏👏👏👏👏

[anilkumar-gupd]

If n(A)=n, then what is the number of the non empty subsets of A. Can any one answer it?

[desiratnasarihutasoit]

Hello, sir
What if we have a question like this
P={9, 10, 11, 12, 13, 14}
Q={12, 11, 10, 9, 8}
How to answer Q ૯ P =...?

[Niiiko]

Talking a little fast but thanks for the explanation.