yah not really, i figured it was the irrationals, but not sure about proving that heh
the way my teacher does it is he proves both ways.
so in -<<<
Suppose q = 0 = x/y
qa = 0a = 0 =x/y
therefore qa is rational if q=0
but going ->>>>
suppose qa is rational
q=
.
.
.
.
.
=0
that's what i dont understand how to do, i think i understand the first part, but not the second direction.