; This problem demonstrates how to solve a user-defined
; transcendental function of time.
; The problem is to calculate MassUnknown, the mass of
; 100 kg uranium 238 after one million years.
; Also calculate how long it would take to decay to 1 kg.

 Mass(Years) := InitialMass * 2^(-Years/HalfLife)
 InitialMass = 100
 HalfLife = 10e6
 MassUnknown = Mass(1e6)
 1 = Mass(TimeUnknown)