
 PlanetMath: elementary function 
  An elementary function is a real function (of one variable) that can be constructed by a finite number of elementary operations (addition, subtraction, multiplication and division) and compositions from constant functions, the 
  ), algebraic functions, exponential functions, logarithm functions, trigonometric functions and cyclometric functions. 
  This is version 14 of elementary function, born on 20041025, modified 20050526. 
 planetmath.org /encyclopedia/ElementaryFunction.html (147 words) 
