#topology #humor

a³-b³=(a-b) (a²+ab+b²)
#geometry

Klein bottle #topology

Japanese theorem:
no matter how one triangulates a cyclic polygon, the sum of inradii of triangles is constant.

The Cistercian monks invented a numbering system in the 13th century which meant that any number from 1 to 9999 could be written using a single symbol.
#history

#latex basics

Surface area of sphere
#geometry #integrals

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#calculus #integration #byparts

#pascalstriangle #fibonacci

#geometry #angles #sin #cos

#angles #sin #cos