# Questions tagged [symbolic]

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

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### Can't simplify expression with square roots of square roots

I'm very new to Mathematica, and I've been using it to evaluate some symbolic expressions in my research that are too complicated to do by hand. However, some of them don't simplify when it is obvious ...
• 21
27 views

### Notation package problem [duplicate]

I am using Mathematica 12.3.1 on Windows 10. I am trying to load the Notation package: Needs["Notation"] and I get the following: It seems the package ...
• 593
38 views

### Terms of expressions with non-commutative multiplication that meet the given criteria

There is the following expression: expr=a^3**x**Transpose[x]**y+x+y**Transpose[y]**x**a^3+x**Transpose[y] It is necessary to apply the ...
• 1,636
103 views

### Introduce formal symbols indexed by natural numbers

I'm going to describe a toy example here which I'm hoping with some help, I can then soup up into the more complex application I have in mind. Suppose the input is a list of lists, and for now take ...
• 1,287
1 vote
29 views

### Getting the same result from Integrate as Probability

I'm trying to solve a Baysian inference problem (although the details are not all that important for this question) I define two probability distributions P and <...
• 819
30 views

### Noncommutative multiply - expand expression - And then assembly back without NCAlgebra

The topic Noncommutative multiply- expand expression discussed how to expand parentheses in an expression using the Distribute command and using non-commutative ...
• 1,636
74 views

### 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 ...
• 111
83 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 ...
• 2,760
1 vote
48 views

### Derivative of quadratic form in NCAlgebra

I installed the NCAlgebra package in the hope that it contains enough rules for symbolic work with most branch-matrix expressions. ...
• 1,636
39 views

### How to analytically solve for an intersection of two functions on an interval?

I would like to analytically solve for the intersection of two functions on a given interval and store the solution as a function (of parameters) for later use. How can I tell Mathematica to look for ...
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58 views

### Collecting terms in an expression using a specific pattern

I have the following expression: ...
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77 views

### Assumptions in Integration for positive real values [closed]

I want to evaluate the following integral in Mathematica. $$\int_0^\infty \frac{a^{-t}-b^{-t}}{t} dt = \ln \left(\frac{\ln b}{\ln a} \right)$$ I try to enter this, but Mathematica can't figure it out....
1 vote
80 views

### How to find that this be always real number

I don't know how to find out this is be real number for l[y]? ...
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72 views

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1 vote
50 views

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### rewriting the solutions of symbolic 3rd and 4th order polynomials

I have symbolic third and fourth-order polynomials which read. $F_{3}= x^3+p x +q,$ $F_{4}= x^4+p_{0} x^2 +q_{0} x + r_{0}.$ Using the Mathematica, I can find the roots of these polynomials using <...
• 295
142 views

### How to guide Eliminate or GroebnerBasis to reduce a set of simple odes to a single ode (which can be done by Laplace Transform)

Recently, I am trying to use Eliminate or GroebnerBasis to simplify a system of ODEs. I don't want the solution of ODEs. What I ...
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