Questions tagged [simplifying-expressions]

Questions on manipulating complicated expressions and making them look simpler using Simplify, FullSimplify and Reduce.

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Simplify rules with variable number of arguments

Problem How to simplify the following rules? The rules simplify (single, double, triple ...) summations of Kronecker delta. Replacement should occur if any summation and the Kronecker delta share an ...
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Simplify sum of Kronecker delta

The following simplification is correct: $$\sum_{j=1}^{J}\sum_{k=1}^{K} \delta_{a, j}\delta_{b,k}A_{j,k} = A_{a, b}$$ How to make Mathematica do that? Try: ...
72 views

Simplify and Sign working only in small expressions

I'm trying to find the sign of some very long expressions, but I don't seem to make it work using Simplify[Sign[...], Assumptions ...]. Here is an example of my problem. I can easily find the sign of ...
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Mathematica can't solve system of equations

I'm trying to solve an admittedly gnarly system of equations: ...
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Expression simplified for explicit int values, but not with FullSimplify/FunctionExpand and Assuming. What formula does Mathematica use?

I have a $_4F_3$ hypergeometric function (Mathematica 11.3) HypergeometricPFQ[{1, 3/2 + n, 1 + 2 m + n, 1 + 2 m + n}, {2 + n, 2 + n, 3/2 + 2 m + n}, z] If I ...
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Simplifying with restrictions on the whole expression

Suppose, for the sake of keeping things as simple as possible, that I have the following equation that I wish to simplify in Mathematica: $y = x x$ But suppose further that I also have a restriction,...
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FullSimplify not simplifying expression containing the form Sin[n] where n is an integer [closed]

I have a function f[n] which give 0 for integer input, but FullSimplify doesn't work for it, why? ...
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Simplify product of complex numbers

I am trying to take product of a complex number with its conjugate. When I take A*Conjugate[A] // FullSimplify The output is as desired ...
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Eliminating radicals from denominator or numerator of an expression

I need to find the limit when r2 tends to r1 of the following expression: ...
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Remove Abs from Norms of Vectors

I have the following norm Norm[{a, b*c}] (* Sqrt[Abs[a]^2 + Abs[b c]^2] *) How do I remove the Abs from it? ...
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How to force an expression to be shown in terms of a specific function?

I have an integral inte1 as below: ...
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How to force DSolve to return ODE solution in terms of BesselK instead of BesselY

I'm trying to solve the following problem: ...
142 views