In 1928, Ackermann? considered a function A(m, n, p) of three variables, the p-fold iterated exponentiation of m with n, and proved that it is a recursive function which is not primitive recursive. This definition was later simplified by Rosza Peter and Raphael Robinson to the two-variable definition given above. |
In 1928, [Wilhelm Ackermann]? considered a function A(m, n, p) of three variables, the p-fold iterated exponentiation of m with n, and proved that it is a recursive function which is not primitive recursive. This definition was later simplified by Rosza Peter and Raphael Robinson to the two-variable definition given above. |