Provide mathematical functions on floating-point numbers. This is a sub-signature of REAL.

signature MATH =
sig
  type real
  val acos : real -> real
  val asin : real -> real
  val atan : real -> real
  val atan2 : real * real -> real
  val cos : real -> real
  val cosh : real -> real
  val e : real
  val exp : real -> real
  val ln : real -> real
  val log10 : real -> real
  val pi : real
  val pow : real * real -> real
  val sin : real -> real
  val sinh : real -> real
  val sqrt : real -> real
  val tan : real -> real
  val tanh : real -> real
end