# Questions tagged [expression-manipulation]

How to manipulate expressions structurally, not necessarily complying with the rules of algebra.

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### Maintain written order in expression (lexicographic sorting rules) [duplicate]

Is there any way I can get output to follow the exact order that I wrote it? For instance (simple example) x = z + a - b + c^2 comes out as ...
275 views

### How to take a part from a list without evaluating it

Consider I have a list l ...
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### Making strict replacements in Mathematica

My question is quite a simple one, but I have not been able to find a solution yet. Say I have terms of the form e.g 1/n1/n2/n3/n4 and ...
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### Can Mathematica reliably determine the equality of any two constructible numbers?

A constructible number is any number which can be expressed with only natural numbers and the operators $+$, $-$, $\times$, $/$, $\sqrt{}$ (square root only). Is Mathematica's ...
160 views

Consider ...
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### How to take a factor out of brackets?

I have an expression like this (E^(-(j + k) y) (-1 + E^(i y)))/(j k) I would like to take E^(i y) out of the brackets to get ...
275 views

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### Implementing commands in the style of Factor to manipulate Trig functions.

What I would like to do is manipulate and simplify trig functions as they appear often in my calculations. What I would like to do is to use the double angle identities. Here is what I have ...
115 views

### How to rewrite a function in a more compact and generalized way?

Consider a function as ...
117 views

### Make a conjunction of expression from a list

I have a rather silly question, I assume: I have a (nested) list of polynomials that I made from a matrix with the Minors command and I would like to make them ...