Can anyone prove or disprove

I think you have to split it up into two parts, but whenever I do it one way I can't get the same exact argument to go back the other way.

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- March 5th 2009, 11:30 AMhoran[SOLVED] set proof help
Can anyone prove or disprove

I think you have to split it up into two parts, but whenever I do it one way I can't get the same exact argument to go back the other way. - March 5th 2009, 11:52 AMrunning-gag
- March 6th 2009, 03:41 AMGrandadSet Theory Proof
- July 17th 2009, 08:43 AMdoresa
hello running-gag

how can you say like that.. - July 17th 2009, 11:01 AMGrandad
Hello doresaYou're just quoting part of the whole proof here. Obviously you can't say that, in general, .

But the bit you're quoting is from a line that starts: If ... In other words, it pre-supposes that . Therefore if*in addition*, then .

Is that OK now?

Grandad - July 18th 2009, 09:48 AMdoresa
ok.thank you