Solutions to "Basic Category Theory" by Tom Leinster

"The Gray House is an astounding tale of how what others understand as liabilities can be leveraged into strengths. Bound to wheelchairs and dependent on prosthetic limbs, the physically disabled students living in the House are overlooked by the Outsides. Not that it matters to anyone living in the House, a hulking old structure that its residents know is alive. From the corridors and crawl spaces to the classrooms and dorms, the House is full of tribes, tinctures, scared teachers, and laws--all seen and understood through a prismatic array of teenagers' eyes. But student deaths and mounting pressure from the Outsides put the time-defying order of the House in danger. As the tribe leaders struggle to maintain power, they defer to the awesome power of the House, attempting to make it through days and nights that pass in ways that clocks and watches cannot record."-- From back cover