Question

Can someone explain to me why this function, x=f^-1(y), then y=f(y). is false?

Answer 1

because y = f(x) is true so that y = f(y) must be false. hihihi

Answer 2

i don't understand

Answer 3

There is exception though. if y=x, then x=f^-1(y) is true, but y=f(y) is also true, because f(y)=y, hence y=f(y)=y

Answer 4

the answer is false but i'm not sure why