A = { a, b, c, d, e, f, g}
Expression: x = y such that x, y are in A
can x in A refer to the same thing as y in A or can it necessarily not because of the notation x, y in A?
Next time try to word this clearer. Is what you're saying that if I in some context said "$\displaystyle x\in A$" in close proximity to "$\displaystyle y\in A$" do $\displaystyle x,y$ have to be disntinct?