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Thank you..

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- May 8th 2010, 04:59 PMslipz418Set Theory help..
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Thank you.. - May 8th 2010, 05:14 PMPlato
**This is not a homework service**

slipz418, you have posted a set of three problems.

They are nice problems.

What do you expect from us?

Remember that this is not a homework service - May 8th 2010, 05:15 PMgmatt
I'll try to give you some guidance,

the definition of one-to-one is:

and onto:

.

Also to prove that something is not one to one you need to find such that and .

Hope that helps.