MathDB

function (maybe posted before)

Source: Ireland 2001

July 5, 2009

functionalgebra proposedalgebra

Problem Statement

Determine all functions

f: \mathbb{N} \rightarrow \mathbb{N}

which satisfy: f(x\plus{}f(y))\equal{}f(x)\plus{}y for all

x,y \in \mathbb{N}