Euclidean and Non-Euclidean Geometry
From
Needham: Visual Differential Geometry and Forms
Found via
angrystego, Where’s the Euclidean one?
anzich, The circle on the pp ist (almost) euclidean
CyberTailor, c/mildlypenis
QuandaleDingle, The plumbus and the dilsacc are joined by the scungus.
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