Question

How to find triangle inequality? (Complex number)

Answer 1

Answer:

Verify that the function d(z1,z2) is a distance funtion on C and also on any subdomain on C.

I finished all but the inequality, which is what I need assistance with. I don't know how to prove the distance function inequality:

d(z1,z3)≤d(z1,z2)+d(z2,z3)