4 weeks ago paulson 2019-03-19 new material about topology, etc.; also fixes for yesterday's
4 weeks ago paulson 2019-03-18 new material;' strengthened material; moved proofs out of Function_Topology in order to lessen its dependencies
2 months ago haftmann 2019-01-31 proper congruence rule for image operator
2 months ago paulson 2019-01-22 renamings and new material
3 months ago immler 2019-01-07 split off Homotopy.thy