Mathematics · Real Analysis
Which of the following mappings f : &mathbb{R} → &mathbb{R} is an isometry, where &mathbb{R} is equipped with the usual metric?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1f(x) = x - 2✓
- 2f(x) = 2x + 3
- 3f(x) = 2x - 1
- 4f(x) = 3x + 2
Correct answer
f(x) = x - 2
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