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18/20 answers
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Jun
26
comment Does Mathematica have a built-in tool that allows one to operate on both sides of an equation?
Or eqn=3x+8==16; Map[1/16*#&,eqn], or Distribute[1/16 eqn,Equal]
Jun
25
answered Defining symbol shortcuts in the Front End
Jun
25
comment Defining symbol shortcuts in the Front End
I noticed that in version 10.1 the command OptionValue[Options[EvaluationNotebook[]],InputAliases] does not work in a new notebook. I'll write a new answer with my template code for this.
Jun
25
revised How to Clear variables with apostrophe?
Previous Options command fails when run in new notebook under version 10.
Jun
25
revised Can I enter the traditional form for Binomial as input in an expression?
Options output changed in version 10, so I had to modify InputAlias settings
Jun
25
awarded  bugs
Jun
25
comment Using Simplify on a consistent system returns False
@SjoerdC.deVries I just added the bugs tag since people seem to agree.
Jun
25
revised Using Simplify on a consistent system returns False
Added bugs tag after 2 upvotes on my answer.
Jun
25
revised Using Simplify on a consistent system returns False
Other test
Jun
25
answered Using Simplify on a consistent system returns False
Jun
25
comment Using Simplify on a consistent system returns False
@Dr.WolfgangHintze I just restored version 5.2 and can confirm that Simplify leaves the expression unchanged there (on Mac OS X). This seems to indicate that the bugs tag is warranted here, and it should be reported to Wolfram.
Jun
25
comment Using Simplify on a consistent system returns False
@Dr.WolfgangHintze Very interesting. Now I regret that I deleted version 5.2 just a few weeks ago...
Jun
25
awarded  Nice Answer
Jun
25
comment Using Simplify on a consistent system returns False
The same happens in version 8. And it also happens with Simplify[x^2==-1||y^2==-1], as if the variables are inexplicably assumed to be real. I agree this shouldn't happen.
Jun
25
answered Steady State Numerical Solution of Heat Diffusion Equation in 2D
Jun
23
answered Problem with “Lighting” in Mathematica V9
Jun
23
revised Strange result when integrating BesselJ functions
added 270 characters in body
Jun
23
revised Strange result when integrating BesselJ functions
Update bug status
Jun
23
comment Where can I find books about how to use Mathematica solving practical problems?
Specifically, you may want to have a look at these books which are classics. Unfortunately, they have never been updated beyond version 5.1. I don't know if I can write an answer, though - the question is very broad. One thing Trott writes in one of his books: "Mathematica ... ages quickly in the sense that in the timescale $10^{1.\text{small integer}}$, a new version will likely be available."
Jun
23
comment How to define an expression which is differently evaluated in calculations and printed
I've done this a couple of times, and maybe these examples help explain the general procedure: How to make traditional output for derivatives, Can I enter the traditional form for Binomial as input in an expression?. If those answers are what you want, I could repeat a summary of the necessary steps and write it as an answer. That could also address what @Kuba is looking for in his comment.