This expression appears on my cryptography homework:
$$G'(k) = G(k \oplus 1^s)$$
It is a description of a Pseudorandom Number Generator where $G:\{0,1\}^s \to \{0,1\}^n$
I just cant see what the "prime" adds, to me it would read the same as:
$$G(k) = k \oplus 1^s$$
Am I missing something?