Theorem Rel.preimage_subset_preimage

Modification history

2025-08-13 00:55

Mathlib/Data/Rel.lean

refactor: rename `Rel` to `SetRel`, restore the old `Rel` (#27447) …

Deleted Rel.preimage_subset_preimage View on Github →

2025-07-06 13:16

Mathlib/Data/Rel.lean

refactor: make `Rel` less see-through (#25587) …

Added Rel.preimage_subset_preimage View on Github →