Pull formulas programmatically from other compilations

[ihsan314]

Upon investigating adjacent efforts to compile formulas, I came across the following sources:

• https://mathworld.wolfram.com/
• http://eqworld.ipmnet.ru/eqarchive/list.php
• https://homepage.ntu.edu.tw/~wttsai/MathModel/Mathematical%20Formula%20Handbook.pdf

None of these are particularly indexable unlike stemformulas, but may be good references. However sourcing from these manually may prove to be a pain. Some or potentially all of these sources might not expose an API endpoint to query but potentially there's some way to get around that.