Pure numeric semantics shared by Java Math dispatch and the bare PTC pow/sqrt helpers.
Math
pow
sqrt
The special-value table follows java.lang.Math while representing NaN and infinities with PTC-Lisp's recoverable signal atoms.
java.lang.Math
@spec pow(number() | atom(), number() | atom()) :: float() | atom()
@spec sqrt(number() | atom()) :: float() | atom()