Commit 2025-01-22 09:34 aaf3fad0

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feat(Logic/Equiv/Basic): sumSigmaDistrib, finSigmaFinEquiv (#19618) Upstreamed from the EquationalTheories project.

Estimated changes

Modified Mathlib/Algebra/BigOperators/Fin.lean

added def finSigmaFinEquiv

added theorem finSigmaFinEquiv_apply

added theorem finSigmaFinEquiv_one

Modified Mathlib/Logic/Equiv/Basic.lean

added def Equiv.sumSigmaDistrib

added def Equiv.uniqueSigma

added theorem Equiv.uniqueSigma_apply

added theorem Equiv.uniqueSigma_symm_apply