1. if X is a set, find

I think it's but I don't know how to show it

2. if , is necessarily justify your answer

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- Sep 24th 2008, 11:01 AMjbpellerin30 minute set theory
1. if X is a set, find

I think it's but I don't know how to show it

2. if , is necessarily justify your answer - Sep 24th 2008, 11:26 AMPlato

Is there a single element in both of those sets?

As for #2. I have no idea what could mean.

In the last century older mathematicians such as R L Moore used it to mean union. Is that the case here? - Sep 24th 2008, 11:31 AMjbpellerin
oops I just held the shift button

it's X = Y - Sep 24th 2008, 11:42 AMPlato