I find these problems easy enough to understand, I just have trouble with proofs that make sense.

For example, if I wanted to prove:

Can I write:

or

and

Hence,

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- February 2nd 2011, 01:43 PMMathSuckerSimple set proofs
I find these problems easy enough to understand, I just have trouble with proofs that make sense.

For example, if I wanted to prove:

Can I write:

or

and

Hence,

- February 2nd 2011, 01:56 PMPlato
If you can use a non 'pick-a-point' proof, here is one.

- February 2nd 2011, 02:15 PMMathSucker
Yeah, I can do that much, but I think I would be accused of only "showing" it. Is the attempt I made above even an actual proof?

- February 2nd 2011, 02:41 PMPlato
- February 2nd 2011, 03:49 PMMoeBlee
delete

- February 3rd 2011, 05:52 AMemakarov
I am struggling to understand the following.First, usually denotes conjunction, which joins propositions, not sets. (Speaking of this, it's not good to use both and "and", as well as - and .) Second, I don't see how the right-hand side

*immediately*follows from the definition of the left-hand side.