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LinearMap.IsIdempotentElem.ext_iff
Modification history
2025-07-13 04:28
Mathlib/LinearAlgebra/Projection.lean
feat(Analysis/InnerProductSpace/Adjoint): idempotent operator `T` is self-adjoint iff `(range T)ᗮ = ker T` (#26855) …
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LinearMap.IsIdempotentElem.ext_iff
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