I wish to retain a copy of posting (for a question posted earlier, but now deleting) for record. How to copy and save with all Tex/MathJax symbols?
You can copy and paste here (by example, surely exist more software or online apps for this) and export it after as a md document, HTML or PDF.
Or just save the content in a .text. There is a lot of apps to convert it after to markdown+mathjax.
Here's a summary of options:
editunder question. This will show its source, which you can copy.
In rare cases when
editis disabled, navigate to
https://math.stackexchange.com/posts/123456/revisions/where 123456 is the Post Id (which you can get either from the URL in your browser, or by clicking "share". This brings up revision history of the post, with links to its source
To save a post in LaTeX format (with markup converted to LaTeX-compatible form), see http://meta.math.stackexchange.com/q/15230/
To save a post in PDF format, see http://meta.math.stackexchange.com/q/15163/
To save the content of comments, see http://meta.math.stackexchange.com/q/3234/