Term.lean`

Explanation legend Lean4 Domain Explanation Language (L4DEL)

L4DEL explanations are a separate layer. They do not change the Lean source. Intuition is explanatory prose; numbered items are a reading path; sources link the wording back to evidence.

L4DEL: Lean4 Domain Explanation Language

Annotation provenance. This overlay contains 10 curated AI-written annotations and 7190 mechanical source-derived annotations. They have not been human-reviewed as explanations; treat them as unverified and not mathematical authority. Retained generation history: The 71 original curated annotations were produced in a Claude Sonnet 5.5 session at medium effort; Claude Opus 5.5 is recorded in that session as the advisor model, not the direct author. The bulk source-derived expansion was generated mechanically from pinned source comments by tooling developed in a GPT-5.6 Sol session at ultra reasoning; GPT-5.6 Sol did not originate the quoted source prose. On 2026-10-17 the mechanically generated source-comment annotations of the Formal Conjectures, Carleson, FLT, PFR, CompFiles, Mathematics in Lean and Theorem Proving in Lean overlays were regenerated by the same generator after three corrections made in a Claude Sonnet 5.5 session: titles no longer cut a sentence inside mathematics or end on a dangling word, workflow markers are removed from the quoted prose, and declaration names follow the scanner's namespace resolution. The boilerplate step line was dropped, and comments that were only a row of dashes no longer yield annotations. No new prose was written and no human review is claimed.

Credit: The upstream authors and contributors retain credit for the project and mathematics. lean4-explainer only renders their pinned source and adds the separately disclosed explanation layer.

Project sources: Pinned project documentation, Formal Conjectures paper, arXiv v1

2 declarations, 0 contain sorry, 0 declared as axioms

Imports (5)

Imported by 2 files

def Lean.Elab.ContextInfo.runMetaMInCommandElabM A copy of ContextInfo.runMetaM that keeps the messages and passes in the same filename line 30 source
Source documentation
A copy of ContextInfo.runMetaM that keeps the messages and passes in the same filename.

standard axioms: Classical.choice, Quot.sound, propext what this means
Statement uses: Lean.Elab.ContextInfo, Lean.LocalContext, Lean.Meta.MetaM, Lean.Elab.Command.CommandElabM
Proof uses: Lean.Core.CoreM, Prod, Lean.Meta.State, Lean.Meta.MetaM.run, Lean.Meta.withLocalInstances, Lean.Meta.Context, StateRefT', IO.RealWorld, List.reduceOption, Lean.LocalDecl, Lean.PersistentArray.toList, Option, Lean.LocalContext.decls, Lean.Meta.Context.mk, Inhabited.default, Lean.Meta.ConfigWithKey, Bool.false, EmptyCollection.emptyCollection, Lean.FVarIdSet, List.toArray and 97 more
44 instances, coercions and auxiliary constants left out.
```
def Lean.Elab.ContextInfo.runMetaMInCommandElabM {α} (info : ContextInfo) (lctx : LocalContext)
    (x : MetaM α) : Command.CommandElabM α := do
…
```
def Lean.Elab.Command.Linter.runTermLinter A linter that applies to terms line 72 source
Source documentation
A linter that applies to terms.
The lint argument receives both the original syntax and elaborated expression, provided the option is enabled. Note that the linter lives in StateT σ, so that it can build up state inherited from parent trees.
This doesn't return a Linter, as then the caller would have to remember to pass the name.

standard axioms: Classical.choice, Quot.sound, propext what this means
Statement uses: Inhabited, Lean.Option, Bool, Lean.Syntax.Term, Lean.Expr, StateT, Lean.Meta.MetaM, Unit, Lean.Elab.Command.CommandElab
Proof uses: Lean.withSetOptionIn, Lean.Syntax, Bind.bind, Lean.Elab.Command.CommandElabM, Lean.Elab.Command.State, MonadState.get, StateRefT', IO.RealWorld, EIO, Lean.Exception, Lean.Elab.Command.Context, ST, BaseIO, Array, Lean.Elab.InfoTree, Lean.PersistentArray.toArray, Lean.Elab.InfoState.trees, Lean.Elab.Command.State.infoState, ite, Eq and 70 more
50 instances, coercions and auxiliary constants left out.
```
def runTermLinter {σ} [Inhabited σ] (opt : Lean.Option Bool)
    (lint : Term → Expr → StateT σ MetaM Unit) : Command.CommandElab :=
…
```