two short questions

1.

Now is this right? ?

2. Why does this hold:

I know that is a subset of A and B. But why does this hold, when we have a function?

thanks for the help

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- Sep 28th 2008, 07:09 AMkuntahtwo short questions
two short questions

1.

Now is this right? ?

2. Why does this hold:

I know that is a subset of A and B. But why does this hold, when we have a function?

thanks for the help - Sep 28th 2008, 07:38 AMPlato