7.68.1 Top new questions this week

7.68.1.1 Halloweenmath contest (in memory of GuM)
7.68.1.2 Create fancy environment in Tikz
7.68.1.3 What is the role of the different entities (TexLive, pdlatex, latexmk) in the LaTeX ecosystem?
7.68.1.4 Parse WolframAlpha's matrices into LaTeX
7.68.1.5 How to force LaTeX to error when an \include file is missing/misspelled?
7.68.1.6 How to reproduce this CYK parse table in TikZ?
7.68.1.7 Shading a heart
7.68.1.1 Halloweenmath contest (in memory of GuM)

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620788

Halloween makes me remember our dear friend GuM, who passed away this year in January. 
I was thinking of a way to celebrate him. 
I would like to ask you to show us something written with his probably ... 
[fun]
 
asked by CarLaTeX https://tex.stackexchange.com/landing/r/digest?cta=user&id=101651 38 votes
answered by Sebastiano https://tex.stackexchange.com/landing/r/digest?cta=user&id=117876 18 votes
7.68.1.2 Create fancy environment in Tikz

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620875

Trying to prepare homeschool reading material for kids in lockdown and I would love to use an environment like the one below: 
I adapted codes from enter link description here 
Credit @SebGlav and made ... 
[tcolorbox] [tikz-styles]
 
asked by Kidegalize https://tex.stackexchange.com/landing/r/digest?cta=user&id=244658 13 votes
answered by David Purton https://tex.stackexchange.com/landing/r/digest?cta=user&id=87678 24 votes
7.68.1.3 What is the role of the different entities (TexLive, pdlatex, latexmk) in the LaTeX ecosystem?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620596

I used to just compile my tex files using overleaf, which took care of everything under the hood. Now I'm trying to figure out what the different programs do. I know that e.g. Texlive and MikTex ... 
[pdftex] [texlive] [latexmk]
                                                                                  

                                                                                  
 
asked by user56834 https://tex.stackexchange.com/landing/r/digest?cta=user&id=147982 12 votes
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 19 votes
7.68.1.4 Parse WolframAlpha's matrices into LaTeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620338

I sort of have the same issue as this question, but the reverse. 
It is often the case that I need to write out a matrix in LaTeX, one resulting from a computation of some sort. Of course, the ... 
[macros] [matrices] [wolfram-mathematica]
 
asked by Eevee Trainer https://tex.stackexchange.com/landing/r/digest?cta=user&id=176173 12 votes
answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/digest?cta=user&id=25858 11 votes
7.68.1.5 How to force LaTeX to error when an \include file is missing/misspelled?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620515

The only file which was meant to be compiled in my Main.tex was specified by the following line: 
\include{transformtaion} 
It was compiled without any error using the following command: 
pdflatex -... 
[pdftex] [errors] [external-files] [include] [compilation-error]
 
asked by Alish https://tex.stackexchange.com/landing/r/digest?cta=user&id=211422 11 votes
answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 15 votes
7.68.1.6 How to reproduce this CYK parse table in TikZ?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620876

I would like to reproduce this triangular table of square nodes in TikZ, shown below. 
I do have a MWE, but it's really not much: 
\documentclass[tikz,border=2mm]{standalone} 
\usetikzlibrary{matrix, ... 
[tikz-pgf] [tikz-matrix]
 
asked by Jason1923 https://tex.stackexchange.com/landing/r/digest?cta=user&id=230326 8 votes
answered by ABC https://tex.stackexchange.com/landing/r/digest?cta=user&id=255043 7 votes
7.68.1.7 Shading a heart

https://tex.stackexchange.com/landing/r/digest?cta=question&id=620785

I want to draw and fill the below heart with TikZ package. 
I use the shading option for the whole heart or two semi-heart curve. 
It seem the heart divided! 
Please help me correct the suitable shading ... 
[tikz-pgf] [shading] [tikz-fadings]
 
asked by Nam Tran Le https://tex.stackexchange.com/landing/r/digest?cta=user&id=193916 8 votes
answered by hpekristiansen https://tex.stackexchange.com/landing/r/digest?cta=user&id=8650 12 votes