Summation rules

For example, [sr2] is nothing but the distributive law of arithmetic C an) C 01 C02 C an [sr3] is nothing but the commutative law of addition bl) ± b2) (an Summation formulas: n(n -4- 1) [sfl) k [sf2] Proof: In the case of [sfl], let S denote the sum of the integers 1, 2, 3, n. Let us write this sum S twice: ................
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