[isabelle-dev] NEWS: High-quality blackboard-bold symbols

Makarius makarius at sketis.net
Mon Mar 22 00:06:33 CET 2021

*** Document preparation ***

* High-quality blackboard-bold symbols from font "txmia" (package
"txfonts"), for A..Z.

This refers to Isabelle/b138cdd22cfb.

That is a spin-off from the Z Notation support, because that requires
additional blackboard-bold symbols.

I've always found the approximation from AMS rather crude, and actually Joris
van der Hoeven (TeXmacs) agrees with that, see

The ultimate source for LaTeX symbols is
https://tug.ctan.org/info/symbols/comprehensive/symbols-a4.pdf --- table 316
on page 123 was relevant for the hint on txmia/txfonts.


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