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functions

Source: Austria 1989

July 10, 2009
functionalgebrapolynomialalgebra unsolved

Problem Statement

Determine all functions f:N0→N0 f: \mathbb{N}_0 \rightarrow \mathbb{N}_0 such that f(f(n))\plus{}f(n)\equal{}2n\plus{}6 for all n∈N0 n \in \mathbb{N}_0.
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