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

0
votes
2answers
I am new to Mathematica so pardon me for the elementary question. Can some one kindly explain that what is happening in the simple code below? The With command does not work in the first case but …
asked Mar 4 '16 by H. R.
0
votes
1answer
I wrote a function that exchanges integration and summation in an expression. Exchange[Eq_] := Module[{Rule, Expr, S, L}, Rule = Inactive[Integrate][Inactive[Sum][Expr_, S_], L_] -> Inacti …
asked Mar 19 '16 by H. R.
5
votes
1answer
I am using Mathematica 11.0.1.0. I have the following simple code ClearAll["Global`*"] L[f_] := Laplacian[f, {r, \[Theta], z}, "Cylindrical"] B[f_] := Laplacian[ Laplacian[f, {r, \[Theta], z}, "C …
asked Mar 27 '17 by H. R.
1
vote
1answer
I already know that there are built-in functions to compute the Fourier coefficients but I want to derive their formulas manually. In fact, I want to obtain the final well-known formulas for the coeff …
asked Mar 17 '16 by H. R.
8
votes
1answer
Bug introduced in 10.2.0 or earlier and fixed in 10.4.0 Consider the following code. ClearAll["Global`*"] InactSum = Inactive[Sum] InactInt = Inactive[Integrate] A = InactInt[ Subscript[\[Phi] …
asked Mar 18 '16 by H. R.
10
votes
2answers
I am new to Mathematica so this question may seem rudimentary. Sorry for that! :) I want to implement the well-known property of Kronecker's Delta $$\Sigma_{i=1}^{n} a_i \delta_{ij}=a_j,\quad 1 \le …
asked Mar 25 '16 by H. R.