Checked fact 179918 Oct 2026Research

The Axioms page says sorryAx is used in the implementation of the sorry tactic and term, and that uses of this axiom are not intended to occur in finished proofs, as it can be used to prove anything.

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The axiom sorryAx is used as part of the implementation of the sorry tactic and sorry term. Uses of this axiom are not intended to occur in finished proofs, as it can be used to prove anything

What the source said when we opened it, on 18 Oct 2026.

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Lean reference: Axioms
Lean FRO / Lean project

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Checked by the notis newsroom on 18 Oct 2026, against the source above.

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How Lean checks an AI-written proof, and where that stops 18 Oct 2026

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“The Axioms page says sorryAx is used in the implementation of the sorry tactic and term, and that uses of this axiom are not intended to occur in finished proofs, as it can be used to prove anything.” ai notis, checked 18 Oct 2026. Source: Lean reference: Axioms (Lean FRO / Lean project). https://ainotis.com/c/1799

As a reference (APA style)

ai notis. (2026, October 18). The Axioms page says sorryAx is used in the implementation of the sorry tactic and term, and that uses of this axiom are not intended to occur in finished proofs, as it can be used to prove anything [Checked claim 1799]. ai notis. https://ainotis.com/c/1799

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