# Questions tagged [simplifying-expressions]

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

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### A question about simplifying

From basic examination, the following expression Integrate[Abs[a - x], {x, 0, n}] appears to simplify fully to 5 n - n a + a^2 ...
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### Remove specific terms from Mathematica output

I have a very complicated output from Mathematica - which may run to several pages - and I want to keep only some of the terms. The expression I am working with is a double summation. It results in (...
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### How do I write Sqrt[x] as x^(1/2)

Sometimes it is needed to keep the powers as the fractional form. However Mathematica tends to write x^(1/2) as Sqrt[x]. How do ...
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### How can I get a matrix valued function to act like a matrix instead of a scalar?

A small example illustrating the issue: If p:={{1,0},{0,0}}; q:={{0,0},{0,1}}; a[t_]:=Piecewise[{{p,t<=0},{q,t>0}}]; And I then define ...
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### Addition of matrices not working as intended with piecewise definition

A somewhat minimal working example: I define p:={{1,0},{0,1}}, q:={{2,0},{0,2}}, and finally ...
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### Map a function at one "part" of each term in a multivariate polynomial

I have polynomials in several variables x[i] and y[j], and I am using First@SymmetricReduce@ ...
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### Simplify 1+Sqrt[2]I-Complex[1,Sqrt[2]]

The expression 1+Sqrt[2]I-Complex[1,Sqrt[2]] should be zero. In fact, N[1+Sqrt[2]I-Complex[1,Sqrt[2]]] yields ...
68 views

### Result not simplified

The following script gives not the simplest result. What should be the right command to get the simplest result? ...
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