- #1

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## Homework Statement

http://img641.imageshack.us/i/mathy.png/

## Homework Equations

## The Attempt at a Solution

a) For every x(Q)x and for every xP(x) AND for every xQ(x) and for every xP(x).

-> Therefore, it is equivalent, right? Do I do it like this for the other ones, too?

b) Looks the same to me, so it's also equivalent ?

c) I think this statement is contradictory -> not equivalent.