Calculating the norm of a complex number

from blog Eli Bendersky's website, | ↗ original
In this quick post I'll dispel a common confusion in the basic math of complex numbers. It's often useful to calculate the norm-square (also known as absolute square) of a complex number z. This norm-square is denoted |z|^2. One could naively expect that: \[|z|^2=zz\] However, that's false …