Abstract Algebra - 3.2 Subgroup Tests

[@yasmineady2737]

Thank you for explaining the one-step test. I think you are better than the textbook. Straight to the point.

[@user-hn3xy5ft4q]

At 8:50 suppose c=ab, then how do we know that c^2=e? Similar argument for closure of inverses too. Please guide

[@SawFinMath]

We only know that if a=(a inverse) and b=(b inverse)

[@dmitrybudurov9843]

hello,can u help me pls with one task, can i write to u personally,it for my exam and if i need to pay smth i will do it

[@SawFinMath]

Of course not.