Revert "add a list of functions with no math implementations"
Revert "add a list of functions with no math implementations"

This reverts commit 7cb2d6e77372b9eca19b46e1c4ee06f17fa2d43f.

stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math