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Székely Identity
Definition
sum_(k = - ∞)^∞(A + B + C + D + E - k E - k)(A + D k + D)(B + C k + C) = (A + C + D + E A + C)(B + C + D + E C + E).
Related term
sum_(k = - ∞)^∞(A + B + C + D + E - k E - k)(A + D k + D)(B + C k + C) = (A + C + D + E A + C)(B + C + D + E C + E).