Ask HN: Why not Programming languages instead of Mathematical Notation?

Why don't educators and modern math text books use programming languages instead of mathematical notation?

As a programmer, I tend to absorb mathematical concepts by writing programs. With the recent emphasis on programming literacy, and the fact that much math ends up expressed in a computer program, why don't educators use programming languages instead of mathematical notation? Mathematical symbols are often difficult to represent without special editors. Modern languages (Python, Ruby, arguably R) can be used to notate algorithms in a few lines of code that replace "pseudocode" type illustrations.