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Project-declaredLean 4.32.0

Sum generalized Kronecker Delta self

sum_generalizedKroneckerDelta_self

Plain-language statement

Full contraction. Iterating the snoc contraction over all four indices: ∑_f δ^{f}_{f} = 4!. Here f ranges over all maps Fin 4 → Fin 4.

physicsquantum field theoryrelativity

Source project: Physlib

Person-level attribution pending.

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