Primitives Recursive Functions

Primitive recursive functions are a class of mathematical functions defined using simple operations like addition and multiplication, along with recursion—where a function is defined in terms of itself for smaller inputs. They are built from basic functions and can be constructed using a series of specific rules. All primitive recursive functions are total, meaning they produce an output for every input. Examples include functions for calculating factorials or Fibonacci numbers. These functions highlight the foundational principles of computation and the limits of what can be effectively calculated using recursion.