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Questions tagged [letter-makes-difference]

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2 votes
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Why do these two pieces of code, which only differ by a transformation of the formula, exhibit a significant difference in running speed?

csn899's user avatar
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1 vote
0 answers

Why does functional form of integration output depend on variables used?

The following integration code is identical, except for the use of integration variables x vs k and constants ...
WillG's user avatar
  • 980
7 votes
1 answer

What is the diffrence between these three commands?

Consider F=1/((x-a)(x-b)) ; G= 1/((x-α)*(x-β)); H=1/((x-r[1])(x-r[2])) ; Using Apart[], the partial fraction decomposition ...
Claude Leibovici's user avatar
1 vote
2 answers

Should expression evaluation depend on the choice of a variable name?

I am verifying the series representation of the Sonine polynomial or the associated Laguerre polynomial, which is $$ L_m^{(n)}(x)=\sum\limits_{l=0}^n\left(-1\right)^l\binom{m+n}{m-l}\frac{x^l}{l!}=S_{...
houzw's user avatar
  • 811
3 votes
1 answer

Do symbolic integration of function including \[ScriptCapitalL]

I have done a symbolic integration in mathematica 13.2 as follow Integrate[-((Sqrt[-r(r - 2 l)] l)/(r(r - 2 l) (-r + l))), r] // Simplify[#, r > 0] & ...
Lain's user avatar
  • 133
2 votes
0 answers

Apart behaves differently depending on specific alphabetic letters of variables

I have stumbled across some weird behaviour with Apart. ans1 = Apart[(x1/r2 + x2/r1)/(1/r1 + 1/r2)] Gives ...
flyingmind's user avatar
0 votes
2 answers

Integration result depending on variable name

From previous threads I have read on the subject, it seems that Mathematica is known to simplify expressions to varying degrees depending on alphabetical order of chosen variable names. But none of ...
aggna's user avatar
  • 3
5 votes
1 answer

Integral depends on choice of symbols

I am trying to perform integrals of the kind $\int dx\frac{x^2-q^2}{z-x+i\eta}$. Mathematica, however, gives back different results whenever I replace the parameter $z$ by $w$, for instance, as ...
Richard van Dongen's user avatar
9 votes
3 answers

DSolve—different solutions for same set of equations using different symbols?

I happen to find that DSolve can give different solutions, even a different number of solutions, for a set of differential equations just by making a change in the ...
Enter's user avatar
  • 1,229
28 votes
1 answer

Are greek symbols causing different evaluation?

I've updated today to Mathematica from version 8 and found something that absolutely confuses me. Let us define a piecewise function: ...
Mike's user avatar
  • 381
40 votes
2 answers

Variable naming changes everything

Bug fixed in 10.0.0 I am having a rather unusual problem I do not understand with Mathematica where renaming one of the variables of my function causes the function to stop "working". Here is the ...
5xum's user avatar
  • 503
10 votes
1 answer

Why does simplification in Mathematica depend on variable names

Mathematica fails to put the following into an obvious simplest form: ...
Eugene Brooks's user avatar
50 votes
2 answers

Why does Simplify ignore an assumption?

Here is the example: Simplify[x + y, x + y == a] Simplify[x + y, x + y == 5] Mathematica 9 output: x+y 5 I expect the ...
Nick Stranniy's user avatar