def Lean.Meta.delta? (e : Lean.Expr) (p : Lean.Name → Bool := fun (x : Lean.Name) => true) : Lean.CoreM (Option Lean.Expr)

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def Lean.Meta.deltaExpand (e : Lean.Expr) (p : Lean.Name → Bool) : Lean.CoreM Lean.Expr

Low-level delta expansion. It is used to implement equation lemmas and elimination principles for recursive definitions.

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def Lean.MVarId.deltaTarget (mvarId : Lean.MVarId) (p : Lean.Name → Bool) : Lean.MetaM Lean.MVarId

Delta expand declarations that satisfy p at mvarId type.

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def Lean.MVarId.deltaLocalDecl (mvarId : Lean.MVarId) (fvarId : Lean.FVarId) (p : Lean.Name → Bool) : Lean.MetaM Lean.MVarId

Delta expand declarations that satisfy p at fvarId type.

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