Hi
It is an operation that's made up for the problem
It's on a practice SAT test.
If x (then there's a symbol that's a filled in diamond) y = x^(1/y), then (-3 (filled in diamond) 1/3) (filled in diamond) 1/3 = ?
I understand how to solve it, but is the filled in diamond an operation that's made up for the problem, or is it a known operation?