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Theorems · Definition · logic and foundations

Hyperreal.Infinitesimal

Deprecated since 2026-01-05Use ArchimedeanClass.mk instead.

ℝ* → Prop

A hyperreal number is infinitesimal if its standard part is 0. Do not use. Write 0 < ArchimedeanClass.mk x instead.

Defined in
Mathlib.Analysis.Real.Hyperreal
Cited by
41 results in Mathlib
Foundations
Depth 114 from the axioms · uses propext, Classical.choice, Quot.sound

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Cited by41

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