Thread: oneto-one and onto composition proof for lin alg

can sum1 help me solve this

PROVE.
Suppose that f: M -> N and g: N->P are mappings, where M, N AND P ARE SETS. Show that if (g o f) t(his is the compositon notation), then f is
1-1 and g is onto.

You have not stated that correctly.
See the attached file for a proof.

thank uu