6.6.1 Top new questions this week

6.6.1.1 What causes Module variables to leak?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221436

Sometimes, after writing code like 
 
f[] := Module[{a}, ...] 
 
 
and running f[] multiple times, there will be many Temporary symbols of the form a$123 in the Global namespace. Sometimes this happens  ... 
[scoping]
 

asked by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 25 votes

answered by Leonid Shifrin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81 22 votes

6.6.1.2 Looping through all functions defined in Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221555

Is there a way to loop through all the Functions (Elementary and Special functions) that exist in Mathematica? 
 
I want to construct a table of some identities and maybe I can discover something  ... 
[special-functions] [built-in-symbols]
 

asked by Micha Kuczynski https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72609 12 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 13 votes

6.6.1.3 Solver for COVID-19 epidemic model with the Caputo fractional derivatives

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221609

As it is known in biological system with memory it would be suitable to use fractional derivatives to describe evolution of the system. 
In a current version of Mathematica 12.1 there is no special  ... 
[differential-equations] [calculus-and-analysis]
 

asked by Alex Trounev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=58388 10 votes

6.6.1.4 Possible bug in finite sum over inverse squares $\sum\limits_ i=1 ^n \frac 1  (x (n-i)+i)^2 $

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221373

Revisiting the problem Limit of partial sums involving inverse squares I found another difficulty with Sum[] 
 
Consider this sum 
 
s[x_, n_] :=  Sum[ 1/(i + (n - i) x)^2, {i, 1, n}] 
 
 
Here we assume x  ... 
[special-functions] [summation]
 

asked by Dr. Wolfgang Hintze https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=16361 10 votes

answered by Soner https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=49198 13 votes

6.6.1.5 Removing banal words from a list

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221540

NB: I am aware of the DeleteStopwords symbol. 
 
I want to remove from a list of words the ones that are likely to be more banal. So for instance if we have 
 
{"exegesis", "mystification", "bread",  ... 
[string-manipulation] [data] [parsing] [natural-language]
 

asked by Diffycue https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46327 9 votes

answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 10 votes

6.6.1.6 How to reproduce Wolfram Language's base64 encoded string with command-line tool?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221381

With Wolfram Language: 
 
In[7]:= ExportString["foobar", "Base64"] 
 
Out[7]= "Zm9vYmFyXDo0ZTJkXDo2NTg3" 
 
 
With the closest command-line software I could think of 
 
echo -n 'foobar' | openssl base64     ... 
[export] [string-manipulation] [command-line]
 

asked by qazwsx https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=357 9 votes

answered by Jason B. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9490 17 votes

6.6.1.7 Does the following change to MKL environment variable boost Mathematica speed on AMD CPUs

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=221767

I personally do not have an AMD CPU but since they are literally becoming quite hot these days, I thought whether the following fix (as proposed here:  ... 
[performance-tuning] [mkl]
 

asked by Ali Hashmi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=27331 7 votes

answered by ilian https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=145 9 votes