f is not bijiection
proof:
we can find tow members of R ,1 and -1 such that
f(-1)=f(1) = 2/3
so f is not into.
because bijection must be both into and onto.
therefore f is not bijection.
f is not bijiection
proof:
we can find tow members of R ,1 and -1 such that
f(-1)=f(1) = 2/3
so f is not into.
because bijection must be both into and onto.
therefore f is not bijection.