wenzelm [Wed, 17 Mar 2021 22:24:57 +0100] rev 73446
more Isabelle symbol definitions for Z Notation, based on https://github.com/isabelle-utp/Z_Toolkit 998c9f7880d3 by Simon Foster;
NB: no bold version of 0x2900 due to fontforge crash "Internal Error: Some fragments did not join";