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Wrong codes for "phi" and "varphi" in ASCIIMathML #353
Unicode got it wrong in an early version and corrected it in a later version. Obviously this creates all kinds of problems since there are fonts and other implementations that still contain the old, wrong Unicode assignments. In fact, my guess is that they outnumber the ones that have it right. A total mess! If you search online for “phi varphi Unicode”, you can see a lot of mentions of the problem.
The AsciiMath translation is done via an actual copy of
You can, however, add configuration to your page that will switch the values. If you add:
to the page somewhere before the script that loads