HomeSketchesSimple visualisations of mathematical subjects. More sketches — in the Russian version
Cat on a ladder Normal number πSquare of a sumTriangle interior angles sumOdd numbers sum Szilassi polyhedronPeriodic billiard trajectoryParabola optical property Are there many prime numbers?Ellipse as an envelope Walking toursTwo circles Duality of regular polyhedronsParabolic sieveAstroid Tricky cubeEllipsis optical property Platonic solidsNonperiodic tilingParabola as an envelope Reutersvärd’s Impossible TrianglePythagorean triangle Tetrahedron altitudesHyperbola and ellipse perpendicularityRoom illuminationHypocycloidRotorTimber raftingEquivalency and equidecomposabilityHyperbola as an envelope
