doc-src/ProgProve/Thys/ROOT.ML

renamed contravariant relator set_rel to vset_rel, to make room for new covariant relator

Printer.show_question_marks_default := false;

use_thys [
 "Basics",
 "Bool_nat_list",
 "MyList",
 "Types_and_funs",
 "Logic",
 "Isar"
];