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For questions related to geometric shapes, congruences, similarities, transformations, as well as the properties of classes of figures, points, lines, angles.

8 votes

Why do we care about multiple proofs of the same theorem?

Claude Monet did a famous series of over 20 paintings, all of one or two haystacks, all in the the same field, with various types of light and weather conditions. Here's one example: Here is anoth …
Vadim Ponomarenko's user avatar
11 votes

Symmetry - practical uses

Symmetries give profound insight into structure. This is demonstrated by Noether's theorem, proved just under 100 years ago by Emmy Noether (probably the greatest female mathematician in history). N …
Vadim Ponomarenko's user avatar