noun
elementary function
In mathematics, a function built from basic operations (addition, multiplication, exponentiation, logarithms, trigonometric functions, etc.) and their compositions.
初等関数の微分は比較的簡単に求められる。
The derivative of an elementary function can be found relatively easily.
指数関数や対数関数は初等関数に含まれる。
Exponential and logarithmic functions are included among elementary functions.
Special functions (e.g., gamma function, Bessel functions) are not elementary; they are defined through more complex constructions.
Compound of 初等 (elementary, primary) + 関数 (function). A calque from English 'elementary function'.