Collections
Ideas gathered by mathematical landscape rather than by format.
A collection may contain an interactive, an essay, a problem sequence and classroom notes. This makes it possible to revisit one idea at different levels of formality and from different points of view.
ACTIVE COLLECTION
Kolams, tiles and sliding orbits
Binary encodings, edge constraints, graph connectivity, enumeration and the parity structure of the 15-puzzle.
PLANNED
Geometry in motion
Configurations that reveal their structure only when a point, line or circle is allowed to move.
PLANNED
Algebra made visible
Roots of unity, symmetry and transformations viewed through diagrams and computation.
PLANNED
Problems that grow
Olympiad-style questions extended into families, variants and open-ended investigations.