Math Problem Statement
Soit f une fonction définie de R dans R telle que : (quelque soit (x;y)R^2) |f(x)-f(y)| = |x-y|. Montrer que : (Il existe au moins un "a" appartenant à R)((quelque soit x appartient à R)f(x) = x + a ) ou ((quelque soit x appartient à R)f(x)=-x+a)
Solution
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Math Problem Analysis
Mathematical Concepts
Isometry
Real Analysis
Affine Functions
Formulas
|f(x) - f(y)| = |x - y|
f(x) = x + a
f(x) = -x + a
Theorems
Isometries on the Real Line
Affine Function Theorem
Suitable Grade Level
Undergraduate Math
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