Math Problem Statement
Montrer que la fonction f : ]1,+∞[→]0,+∞[ définie par f (x) = 1/x−1 est bijective. Calculer sa bijection réciproque
Solution
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Math Problem Analysis
Mathematical Concepts
Functions
Injectivity
Surjectivity
Inverse Functions
Formulas
f(x) = 1/x - 1
Injectivity: If f(x1) = f(x2), then x1 = x2
Surjectivity: For every y ∈ ]0,+∞[, there exists an x ∈ ]1,+∞[ such that f(x) = y
Inverse function: f⁻¹(y) = 1/(y + 1)
Theorems
Bijective function definition: A function is bijective if it is both injective and surjective.
Suitable Grade Level
University Level
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