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  2. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Gromov's theorem on groups of polynomial growth (geometric group theory) Grushko theorem (group theory) Higman's embedding theorem (group theory) Isoperimetric gap (geometric group theory, metric geometry) Jordan–Hölder theorem (group theory) Jordan–Schur theorem (group theory) Jordan's theorem (multiply transitive groups) (group theory)

  3. List of mathematical proofs - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_proofs

    Fermat's little theorem and some proofs; Gödel's completeness theorem and its original proof; Mathematical induction and a proof; Proof that 0.999... equals 1; Proof that 22/7 exceeds π; Proof that e is irrational; Proof that π is irrational; Proof that the sum of the reciprocals of the primes diverges

  4. Power of a point - Wikipedia

    en.wikipedia.org/wiki/Power_of_a_point

    Secant-, chord-theorem. For the intersecting secants theorem and chord theorem the power of a point plays the role of an invariant: . Intersecting secants theorem: For a point outside a circle and the intersection points , of a secant line with the following statement is true: | | | | = (), hence the product is independent of line .

  5. Five points determine a conic - Wikipedia

    en.wikipedia.org/wiki/Five_points_determine_a_conic

    In Euclidean and projective geometry, five points determine a conic (a degree-2 plane curve), just as two (distinct) points determine a line (a degree-1 plane curve).There are additional subtleties for conics that do not exist for lines, and thus the statement and its proof for conics are both more technical than for lines.

  6. Category:Theorems in plane geometry - Wikipedia

    en.wikipedia.org/wiki/Category:Theorems_in_plane...

    Pages in category "Theorems in plane geometry" ... Garfield's proof of the Pythagorean theorem; H. ... This page was last edited on 10 October 2020, ...

  7. List of lemmas - Wikipedia

    en.wikipedia.org/wiki/List_of_lemmas

    This following is a list of lemmas (or, "lemmata", i.e. minor theorems, or sometimes intermediate technical results factored out of proofs). See also list of axioms , list of theorems and list of conjectures .

  8. Angle trisection - Wikipedia

    en.wikipedia.org/wiki/Angle_trisection

    The geometric series ⁠ 1 / 3 ⁠ = ⁠ 1 / 4 ⁠ + ⁠ 1 / 16 ⁠ + ⁠ 1 / 64 ⁠ + ⁠ 1 / 256 ⁠ + ⋯ or ⁠ 1 / 3 ⁠ = ⁠ 1 / 2 ⁠ − ⁠ 1 / 4 ⁠ + ⁠ 1 / 8 ⁠ − ⁠ 1 / 16 ⁠ + ⋯ can be used as a basis for the bisections. An approximation to any degree of accuracy can be obtained in a finite number of steps.

  9. Langley's Adventitious Angles - Wikipedia

    en.wikipedia.org/wiki/Langley's_Adventitious_Angles

    In 2015, an anonymous Japanese woman using the pen name "aerile re" published the first known method (the method of 3 circumcenters) to construct a proof in elementary geometry for a special class of adventitious quadrangles problem. [7] [8] [9] This work solves the first of the three unsolved problems listed by Rigby in his 1978 paper. [5]

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