Questions tagged [symbolic]

For questions about symbolic computation, as opposed to numerical computations.

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Why Solve is not working? [closed]

I'm new here and I'm a newbie also with Mathematica, so probably this an easy and stupid question. If you have suggestion on how can I learn at least the basics of the language, I appreciate it. I'm ...
2k views

I need to find an explicit expression in radicals for the real root of the quintic equation ...
34 views

Partial Trace with KroneckerProduct

I have some symbolic expression of the form X=KroneckerProduct[A,B]+KroneckerProduct[G,F]+... How can I define a partial trace for this, i.e. a function f: ...
80 views

Solve a symbolic expression

I'm working with the Hoek Brown plastic yield surface to model soil/rock materials. The yield surface is given by: Were sig1 and sig3 are the maximum and minimum principal stresses. sigc, m, s and n ...
71 views

70 views

How to convert an expression of several variables into an operator

Given the expression How can I define the following operator like g[u_, v_] := eq1 The correct definition is
57 views

FullSimplify crashes kernel

I'm trying to simplify an enormous analytic expression as much as possible. When I use Simplify, I get a half-decent result in about 20 seconds. However when I use <...
457 views

Zero result from a positive integral

Bug introduced in 12.2 or earlier and persisting through 13.0.1. How to calculate the following symbolic integral in MMA? Every variable is real. Although the integrand is always positive, MMA (mine ...
1 vote
145 views

Solving equation set with vectors

I have six unit vectors in real $3$D space v1,v2,v3,v4,v5,v6; Represent the dot product between some of the vectors as the Cos ...
104 views

Symbolic partial differentiation of a Lagrangian function including a summation

I'm using Mathematica to double-check that I correctly derived first order conditions for the models I'm researching. Before I get started, I wanted to actually teach myself how to use Mathematica, ...
134 views

Order of boundary condition inside DSolve matters?

Bug introduced in 11.1.1 or earlier, fixed in 12.3.1 or earlier. Consider the following example: ...
674 views

How can I calculate the sum of this series?

Backslide introduced after 9.0.1, persisting through 13.0. How can I calculate the sum of this series? $\sum_{n=1}^{\infty} \ln \left(1+\frac{1}{n^{2}}\right)$ The sum of this series has been proved ...
409 views

Limit problem no longer works in Mathematica 11.1.0

Backslide introduced in 11.1, fixed in 11.2. In Mathematica 11.0, the following limit, Limit[Power[Sqrt[((1 - 4 n)/(3 n + 2))^(3 n)]^2, (n)^-1], n -> ∞] gave ...
119 views

a Sum that no longer evaluates

Backslide introduced in 7.0, fixed after 11.0, in or before 12.3. At http://forums.wolfram.com/mathgroup/archive/2000/Sep/msg00318.html and http://forums.wolfram.com/mathgroup/archive/1999/Jul/...
1 vote
99 views

MomentOfInertia help

Radius and angle must be assigned in order to get the result. When radius and angle are variables, how to get the result? ...
1 vote