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  2. Xuan tu - Wikipedia

    en.wikipedia.org/wiki/Xuan_tu

    Xuan tu or Hsuan thu (simplified Chinese: 弦图; traditional Chinese: 絃圖; pinyin: xuántú; Wade–Giles: hsüan 2 tʻu 2) is a diagram given in the ancient Chinese astronomical and mathematical text Zhoubi Suanjing indicating a proof of the Pythagorean theorem. [1] Zhoubi Suanjing is one of the oldest Chinese texts on mathematics. The ...

  3. Desargues's theorem - Wikipedia

    en.wikipedia.org/wiki/Desargues's_theorem

    The last step of the proof fails if the projective space has dimension less than 3, as in this case it is not possible to find a point not in the plane. Monge's theorem also asserts that three points lie on a line, and has a proof using the same idea of considering it in three rather than two dimensions and writing the line as an intersection ...

  4. Template:Math proof - Wikipedia

    en.wikipedia.org/wiki/Template:Math_proof

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  5. Geometric proof - Wikipedia

    en.wikipedia.org/?title=Geometric_proof&redirect=no

    Download as PDF; Printable version; In other projects Appearance. move to sidebar hide. From Wikipedia, the free encyclopedia. Redirect page. Redirect to ...

  6. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Castelnuovo–de Franchis theorem (algebraic geometry) Chow's theorem (algebraic geometry) Cramer's theorem (algebraic curves) (analytic geometry) Hartogs's theorem (complex analysis) Hartogs's extension theorem (several complex variables) Hirzebruch–Riemann–Roch theorem (complex manifolds) Kawamata–Viehweg vanishing theorem (algebraic ...

  7. 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.

  8. 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 .

  9. Ibn al-Haytham - Wikipedia

    en.wikipedia.org/wiki/Ibn_al-Haytham

    In mathematics, Alhazen built on the mathematical works of Euclid and Thabit ibn Qurra and worked on "the beginnings of the link between algebra and geometry". Alhazen made developments in conic sections and number theory. [124] He developed a formula for summing the first 100 natural numbers, using a geometric proof to prove the formula. [125]

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