Linked Questions

I am not sure if this question has been asked before but anyway, Consider these two examples: ...

There are numerous examples here, whose end result is the removal of empty brackets {} and empty lists. I still can't find an example of simply removing redundant ...

Mathematica provides functions that perform a depth-first postorder traversal, or which use such a traversal, including: Scan, ...

The impossibility of MatchQ-ing inside and Association MatchQ-ing Associations (MMA 10) explains a problem I have. I would like ...

Given a symbol t and an expression expr, how can I determine whether or not the symbol t ...

Is it possible to replace the heads to match a pattern? eg f[f[f[]]] -> a[b[c[]]] or ...

Is there a simple way in Mathematica to prevent rule reordering? Let me give an example: ...

I have a list of strings list. I am trying to get rid of some elements that match string pattern patt: ...

ReplaceAll[] might lead to unexpected behavior (at least it surprised me). I use ReplaceAll[] to convert a list (basically data ...

In an answer to this question, rm -rf used the function Replace with level spefication to do a series of replacements inside out. As far as I can see, the order of substitutions when more than one ...

So I've used Mathematica for some months, but I never noticed this sort of thing about it, namely: (a > b) == (b < a) which are supposed to be identical ...

I am dealing with expressions like $$ \textrm{expr}=5D_{4,1}\langle12\rangle\langle23\rangle\big(-\langle15\rangle^2\langle24\rangle\langle34\rangle + \langle14\rangle\langle15\rangle\langle24\rangle\...

I am a little confused about: In what order is a Rule tried to apply to an expression? In a depth-first order or otherwise? For example, ...

I have been trying to understand how mathematica does pattern matching: {Sin[x] + 1} /. Sin -> Cos returns Cos[x] + 1 ...