THE ATIYAH–FLOER COBORDISM EXPLORER
Four dimensions.
Two languages.
A cobordism changes a space.
A comparison changes its mathematical language.
Explore why the order of these operations agrees, from the first handle to the geometry of the proof.
Begin the journey ↓THE STRUCTURAL IDEA
Spaces have invariants.
Transformations have maps.
The comparison must respect both.
FROM PICTURE TO PAPER