पुचः

The manipulations of the Rubik's Cube

A periodic wallpaper pattern gives rise to a wallpaper group

The fundamental group of a plane minus a point (bold) consists of loops around the missing point. This group is isomorphic to the integers under addition.

पुचः धाःगु छुं नं कथंया मनु वा वस्तुया संकलन ख।

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