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  2. Harold R. Jacobs - Wikipedia

    en.wikipedia.org/wiki/Harold_R._Jacobs

    Harold R. Jacobs (born 1939), who authored three mathematics books, both taught the subject and taught those who teach it. [1] Since retiring he has continued writing articles, and as of 2012 had lectured "at more than 200" math conferences. His books have been used by some homeschoolers [2] and has inspired followup works.

  3. Harold Jacobs - Wikipedia

    en.wikipedia.org/wiki/Harold_Jacobs

    Harold M. Jacobs (1912–1995), Jewish and civic leader who headed a number of American Jewish organizations and institutions; also played a significant role in New York City educational affairs Harold R. Jacobs (born 1939), authored three widely used mathematics books, both taught the subject and taught those who teach it

  4. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    This is a list of notable theorems.Lists of theorems and similar statements include: List of algebras; List of algorithms; List of axioms; List of conjectures

  5. Crossed ladders problem - Wikipedia

    en.wikipedia.org/wiki/Crossed_ladders_problem

    Crossed ladders of lengths a and b.h is half the harmonic mean of A and B; equivalently, the reciprocals of A and B sum to the reciprocal of h (the optic equation).Given a, b, and h, find w.

  6. Non-Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Non-Euclidean_geometry

    In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry.As Euclidean geometry lies at the intersection of metric geometry and affine geometry, non-Euclidean geometry arises by either replacing the parallel postulate with an alternative, or relaxing the metric requirement.

  7. Review: In the awkward 'Harold and the Purple Crayon,' a ...

    www.aol.com/news/review-awkward-harold-purple...

    If Harold uses his crayon to pull planes and pies out of thin air, Gary has far more nefarious (and horny) intentions, using the crayon to summon up his fantasy world, complete with powerful ...