I'm struggling to comprehend what this question is asking me.
Let $x$ and $y$ be integers where $$f(x,y)=\begin{cases} 5 & x<y \\ f(x-y,y+2)+1 & x\ge y\\ \end{cases}$$ Express the following relation in it's simplest form: $$f (2,7)$$
So far, I'm guessing this means rewrite into the correct notation. Am I on the right lines when I respond with:
$f$ : $X \leftrightarrow Y$
$x$ E $X$
$y$ E $Y$
$(x,y)$ E F