Mon, 28 Sep 2020 13:53:50 +0200 wenzelm clarified "isabelle logo", after discontinuation of DVI output (see 564012e31db1);
Sun, 27 Sep 2020 23:02:25 +0200 wenzelm suppress ligatures more robustly, notably for lualatex;
Sun, 27 Sep 2020 17:02:59 +0200 wenzelm ISABELLE_PDFLATEX is now lualatex;
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