Math functions.
Min function
[type:class - T] a Value a
[type:class - T] b Value b
v - Min of a and b
Select one of two values depending on the sign of another.
[type:class - T] x Value to test for positiveness
[type:class - T] a Result if test succeeded
[type:class - T] b Result if test failed
v - a when x >= 0, b otherwise
Abs function
[type:class - T] x
v - Absolute value of x