Dalla doc. di pxfonts:
The PX fonts consist of
1. virtual text roman fonts using Adobe Palatino (or URWPalladioL) with some modified and additional
text symbols in the OT1, T1, and TS1 encoding
2. virtual text sans serif fonts using Adobe Helvetica (or URW NimbusSanL) with additional text symbols in OT1, T1, TS1, and LY1 encodings (Provided in the TX fonts distribution)
3. monospaced typewriter fonts in OT1, T1, TS1, and LY1 encodings (Provided in the TX fonts distribution)
4. math alphabets using Adobe Palatino (or URWPalladioL) with modified metrics
5. math fonts of all symbols corresponding to those of Computer Modern math fonts (CMSY, CMMI, CMEX, and Greek letters of CMR)
6. math fonts of all symbols corresponding to those of AMS fonts (MSAM and MSBM)
7. additional math fonts of various symbols]
Da quello che capisco, il pacchetto ridefinisce tutti i font (con grazie, senza grazie, a sppaziatura fissa e matematico) del documento. In particolare, estende e/o modifica i fonts amsmath.
Ciao,
L.