Question

Let P be the set of all people (alive or dead). Let
f: P → P
be such that
f(x)
is the birth father of x. Let y be some person. What is the relationship of
(f compose f)(y)
to y?

Answer 1

f(f(y))
y is some person
f(y) is the birth father of y
so f(y) is y's father
f(f(y)) = f(y's father) = y's fathers father = y's grandfather

Answer 2

zzr0ck3r has it pretty much, the only thing I would add is that (f o f)(y) or f(f(y)) is y's paternal grandfather (ie the grandfather on the father's side, not mother's side)

Answer 3

good call

Answer 4

what is it called if it was on his mothers side?

Answer 5

maternal

Answer 6

word

Answer 7

lol