geogebra.org
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GeoGebra.org is a free dynamic mathematics platform that combines geometry, algebra, calculus, and statistics through interactive applets. It provides tutorials, worksheets, and a large library of user-created resources and activities for exploring geometric concepts and beyond.
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nLab
Encyclopedia of higher category theory and topology
Hatcher's Algebraic Topology
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Explore algebraic topology with Wildberger! Learn to connect abstract algebra to geometric shapes & spaces.
Differential Geometry
Explore differential geometry with N J Wildberger! This course covers curves, surfaces, and manifolds using a rational approach.
Introduction to Topology
Learn the fundamentals of topology with this introductory course from Joseph Keane, covering key concepts in geometry and topology.
The Knot
To many, Russia, and the wider Eurasia, is a riddle, wrapped in a mystery, inside an enigma. But it doesn’t have to be. The Eurasian Knot dispels the stereotypes and myths about the region with lively and informative interviews on Eurasia’s complex past, present, and future. New episodes drop weekly with an eclectic mix of topics from punk rock to Putin, and everything in-between. Subscribe on your favorite podcasts app, grab your headphones, hit play, and tune in. Eurasia will never appear the same. Hosted on Acast. See acast.com/privacy for more information.