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**1. Homework Statement**

Prove uppsidxe Ax, (x is an element Z^+ arrow backwords Ey, backwords Ez, ((y is an element of Q)^(Z is an element of Q)^(yz is not equal to 0)^(x^2=y^2+z^2)

**2. Homework Equations**

**3. The Attempt at a Solution**

Could someone first help me put this into words?

Is it something like this? For every x, where x is an element of the positive integers, then for every y and for every Z, y is an element of W or z is an element of W or yz is not=0 or x^2=y^2+z^2

Could someone show me how to prove this, please?

Thank you very much