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  2. Hinge theorem - Wikipedia

    en.wikipedia.org/wiki/Hinge_theorem

    The hinge theorem holds in Euclidean spaces and more generally in simply connected non-positively curved space forms.. It can be also extended from plane Euclidean geometry to higher dimension Euclidean spaces (e.g., to tetrahedra and more generally to simplices), as has been done for orthocentric tetrahedra (i.e., tetrahedra in which altitudes are concurrent) [2] and more generally for ...

  3. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Hindman's theorem (Ramsey theory) Hinge theorem ; Hironaka theorem (algebraic geometry) Hirzebruch signature theorem (topology, algebraic geometry) Hirzebruch–Riemann–Roch theorem (complex manifolds) Hjelmslev's theorem ; Hobby–Rice theorem (mathematical analysis) Hodge index theorem (algebraic surfaces)

  4. Ptolemy's table of chords - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_table_of_chords

    He used Ptolemy's theorem on quadrilaterals inscribed in a circle to derive formulas for the chord of a half-arc, the chord of the sum of two arcs, and the chord of a difference of two arcs. The theorem states that for a quadrilateral inscribed in a circle , the product of the lengths of the diagonals equals the sum of the products of the two ...

  5. List of inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_inequalities

    Cheng's eigenvalue comparison theorem; Clifford's theorem on special divisors; Cohn-Vossen's inequality; Erdős–Mordell inequality; Euler's theorem in geometry; Gromov's inequality for complex projective space; Gromov's systolic inequality for essential manifolds; Hadamard's inequality; Hadwiger–Finsler inequality; Hinge theorem; Hitchin ...

  6. Ptolemy's inequality - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_inequality

    For four points in order around a circle, Ptolemy's inequality becomes an equality, known as Ptolemy's theorem: ¯ ¯ + ¯ ¯ = ¯ ¯. In the inversion-based proof of Ptolemy's inequality, transforming four co-circular points by an inversion centered at one of them causes the other three to become collinear, so the triangle equality for these three points (from which Ptolemy's inequality may ...

  7. Some hospitals seeing increase in RSV, 'walking pneumonia ...

    www.aol.com/hospitals-seeing-increase-rsv...

    Some hospitals in the U.S. are seeing an increase in RSV and higher levels of "walking pneumonia" among young children despite overall respiratory illness activity remaining low nationally.

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