Beautiful and accessible math in all browsers
As others have pointed out Obsidian is using MathJaX, which is a custom implementation of a subset of TeX. It doesn't support Tikz, which is way different from the equation subset of TeX, but there is a discussion here: https://github.com/mathjax/MathJax/issues/41
TikZJax is TikZ running under WebAssembly in the browser
This was my first thought, but the last comment in that page linked above is promising. Someone has the real tikz running in the web browser, rendering to svg: https://github.com/kisonecat/tikzjax It might a simple matter of translating tikz-fenced code blocks to the appropriate script tag and letting that script do its thing.
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Quickly insert and change latex environments within math blocks in Obsidian.
You maybe referring to this plugin.
Generation of diagram and flowchart from text in a similar manner as markdown
mermaid cannot render basic math symbols as pointed out in this GitHub issue. So it will be very messy to produce something like what OP wants.
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