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 Jul 7 comment Partial Derivative of f with respect to x1 Not clean at all a = Sum[2 x[i]^2 + z, {i, n}]; deriv[i_] := D[a /. n -> i, x[i]]; deriv[3] Jul 7 revised Easy way to bind rect to geometrical 2D line? added 114 characters in body Jul 7 answered Easy way to bind rect to geometrical 2D line? Jul 7 comment Solve a differential equation using the power series method interspersing code and text makes your post difficult to read Jul 7 revised Solve a differential equation using the power series method added 42 characters in body Jul 6 comment Random non-overlapping disks in a square Ok, but "I wish it so and so ..." without showing some effort looks too lazy ... Jul 6 revised Random non-overlapping disks in a square added 13 characters in body Jul 6 comment Performing a convolution for smoothing a function Jul 6 comment Iterative Tree Plot for the Sum of an Integer's Digits Squared I'm not sure is you had "interpreted the question a bit differently". Methinks our results are the same... Jul 6 comment Solving a transcendental equation @MichaelE2 I tend to use Reduce[ ] when you may expect branching issues. You're right in this case, though. Jul 6 revised Solving a transcendental equation added 376 characters in body Jul 6 answered Solving a transcendental equation Jul 6 comment Reduce Inequality @SkSarifHassan You could check the docs for Root[ ] or search for questions in this site involving about it. In any case, if feel too lazy to do that try Root[-4 + 20 #1 - 12 #1^2 + #1^3 &, 2] //N Jul 6 revised Reduce Inequality added 164 characters in body Jul 6 answered Reduce Inequality Jul 6 revised Reduce Inequality deleted 101 characters in body Jul 6 comment Reduce Inequality Please edit your question and add the code there. Thank you. Jul 6 comment Reduce Inequality This is your fourth question and you never posted a single line in the Mathematica language. Please stop posting just TeX and formulas. Jul 6 revised Fitting - Exponential added 39 characters in body Jul 6 revised Fitting - Exponential deleted 1 character in body