Simple but often unknown theorems/lemmas/formula? Do you know?
Difference between en6 and en7, changed 392 character(s)
Hallo everyone,↵
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Do you know any simple formulas that are often unknown to many? For me, some can be mentioned are ↵
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- Graph: Euler characteristic↵
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- 2-Ear Theorem↵
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- Pigeonhole↵
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- Fermat↵
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- Handshaking theorem↵
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- incenter formula of a triangle↵
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- harmonic series sum↵
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- pick theorem↵
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- Shoelace Formula↵
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- McNugget theorem↵
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- Caley Formula, Handshaking theorem, Caley Formula, Kirchhoff's theorem, Kőnig's theorem↵
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- Polygon: 2-Ear Theorem, incenter formula of a triangle, pick theorem, Shoelace Formula↵
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- Logic: Pigeonhole↵
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- Prime: Fermat, Wilson's theorem↵
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- Number: McNugget theorem↵
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- Counting: Burnside Lemma, stars and bars↵
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- Combinatorics Identity: Vandermonde's Identity, Hockey-stick identity↵
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- Math: Linearity of Expectation↵
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- Other: harmonic series sum↵
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... And what about you? Can you share some?↵
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Thank you.

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en8 English duckladydinh 2017-11-28 04:39:46 37 Tiny change: 'orem\n\n- ' -> 'orem\n\n- Fibonacci: Zeckendorf's theorem\n\n- '
en7 English duckladydinh 2017-11-28 04:38:34 392 Tiny change: '- Graph:\n- - Euler c' -> '- Graph:\n - Euler c'
en6 English duckladydinh 2017-11-23 08:15:37 24
en5 English duckladydinh 2017-11-23 08:15:14 60
en4 English duckladydinh 2017-11-22 00:22:47 18 Tiny change: 'ce Formula... And wh' -> 'ce Formula, McNugget theorem... And wh'
en3 English duckladydinh 2017-11-22 00:19:13 19 Tiny change: 'ck theorem... And wh' -> 'ck theorem, Shoelace Formula... And wh'
en2 English duckladydinh 2017-11-20 23:11:19 35 Tiny change: 'a triangle... And wh' -> 'a triangle, harmonic series sum, pick theorem... And wh'
en1 English duckladydinh 2017-11-20 20:32:45 344 Initial revision (published)