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# Calculate a Product Sum

Calculator for product sums, a sum Σ of products Π. The inner product with the running variable j runs from o to p, the outer sum with the running variable i runs from m to n. Only the variables i and j may occur in the sum term. The basic arithmetic operations + - * / are allowed, as well as the power function, like pow(j#i) for j^{i}. Further allowed functions are sin(), cos(), tan(), asin(), acos(), atan(), log() for the natural logarithm and fac() for the factorial. Also, the constants e and pi can be used. If i≠j is chosen, factors with equal running variables are omitted. The double product can quickly lead to very high values.

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