6.4.1 Top new questions this week

6.4.1.1 Why does cmsy10.tfm give the minus sign a positive depth?
6.4.1.2 hyphenation: what special is in word "implementation"
6.4.1.3 Why does the appearance of the backslash in \url, \path and \texttt look different when using lualatex/pdflatex and the package url/xurl?
6.4.1.4 Can this "curvy" region be replicated in TikZ?
6.4.1.5 Why does this throw an error for double subscripting?
6.4.1.6 Annotate equation
6.4.1.7 Space above signature line
6.4.1.1 Why does cmsy10.tfm give the minus sign a positive depth?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=526103

cmsy10.tfm gives a positive depth to the minus sign: 
$ tftopl /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmsy10.tfm | grep -A4 'CHARACTER O 0' 
(CHARACTER O 0 
(CHARWD R 0.777781) 
... 
[fonts]
 
asked by Antony Lee https://tex.stackexchange.com/landing/r/digest?cta=user&id=4101 12 votes
answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 8 votes
6.4.1.2 hyphenation: what special is in word "implementation"

https://tex.stackexchange.com/landing/r/digest?cta=question&id=525575

What special is in the word "implementation" that it is not possible automatic hyphenate in narrower environments as are minipage, TikZ nodes etc, even if in preamble is added hyphenation pattern for  ... 
[hyphenation]
 
asked by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 11 votes
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 23 votes
6.4.1.3 Why does the appearance of the backslash in \url, \path and \texttt look different when using lualatex/pdflatex and the package url/xurl?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=525460

Consider this minimal example: 
\documentclass[varwidth]{standalone} 
%\usepackage{xurl} 
\usepackage{url} 
\begin{document} 
\path{C:\} (path)\\ 
\url{C:\} (url)\\ 
\texttt{C:\textbackslash} (texttt) 
... 
[fonts] [pdftex] [luatex] [url]
 
asked by Volker https://tex.stackexchange.com/landing/r/digest?cta=user&id=13265 9 votes
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 9 votes
6.4.1.4 Can this "curvy" region be replicated in TikZ?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=525437

I'm trying to replicate this picture (from wikipedia) with TikZ: 
The part on the left is straightforward but I'm struggling to come up with ideas for the part on the right. 
[tikz-pgf]
 
asked by Brian Fitzpatrick https://tex.stackexchange.com/landing/r/digest?cta=user&id=31016 8 votes
answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 19 votes
6.4.1.5 Why does this throw an error for double subscripting?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=526117

{\mathbf{\hat{\Sigma}_{\mathrm{hom}}}}_{jj}^{1/2} 
So I thought if you enclosed the term with parentheses, you can do a double subscript, but this throws a double subscript error, and I'm not sure  ... 
[subscripts]
 
asked by Sky https://tex.stackexchange.com/landing/r/digest?cta=user&id=205764 7 votes
answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 7 votes
6.4.1.6 Annotate equation

https://tex.stackexchange.com/landing/r/digest?cta=question&id=525724

I have an equation that uses (\varphi) which I'd like to define with a text, like the following (hardcoded) example: 
The "traditional" way would be to do this in the surrounding text: 
... 
[equations]
 
asked by R. Bosman https://tex.stackexchange.com/landing/r/digest?cta=user&id=151460 7 votes
answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 13 votes
6.4.1.7 Space above signature line

https://tex.stackexchange.com/landing/r/digest?cta=question&id=525501

I'm trying to make a signature block which has enough room above the signature line for a stamp.  But the indicated \vspace seems to have no effect. 
How can I reserve 3cm above the \hline? 
... 
[vspace]
 
asked by Stewart https://tex.stackexchange.com/landing/r/digest?cta=user&id=205379 6 votes
answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 5 votes