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  2. Holt McDougal - Wikipedia

    en.wikipedia.org/wiki/Holt_McDougal

    Holt McDougal is an American publishing company, a division of Houghton Mifflin Harcourt, that specializes in textbooks for use in high schools.. The Holt name is derived from that of U.S. publisher Henry Holt (1840–1926), co-founder of the earliest ancestor business, but Holt McDougal is distinct from contemporary Henry Holt and Company, which claims the history from 1866.

  3. Ron Larson - Wikipedia

    en.wikipedia.org/wiki/Ron_Larson

    Website. www.ronlarson.com. Roland "Ron" Edwin Larson (born October 31, 1941) is a professor of mathematics at Penn State Erie, The Behrend College, Pennsylvania. [1] He is best known for being the author of a series of widely used mathematics textbooks ranging from middle school through the second year of college.

  4. Mass point geometry - Wikipedia

    en.wikipedia.org/wiki/Mass_point_geometry

    Mass point geometry. Mass point geometry, colloquially known as mass points, is a problem-solving technique in geometry which applies the physical principle of the center of mass to geometry problems involving triangles and intersecting cevians. [1] All problems that can be solved using mass point geometry can also be solved using either ...

  5. Houghton Mifflin Harcourt - Wikipedia

    en.wikipedia.org/wiki/Houghton_Mifflin_Harcourt

    The agreement, supported by 100% of HMH's creditors, highlighted a reduction in the senior debt to $3 billion from the current $5 billion, with new equity issued to the senior debt holders (including Paulson & Co. and Guggenheim Partners), [49] conversion of the $2 billion mezzanine debt into equity and warrant, receipt of $650m of new cash ...

  6. Geometry - Wikipedia

    en.wikipedia.org/wiki/Geometry

    v. t. e. Geometry (from Ancient Greek γεωμετρία (geōmetría) 'land measurement'; from γῆ (gê) 'earth, land' and μέτρον (métron) 'a measure') [1] is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. [2] Geometry is, along with arithmetic, one of ...

  7. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . Many writers begin the sequence with 0 and 1, although some authors start it from 1 and 1 [1][2] and some (as did Fibonacci) from 1 ...

  8. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...

  9. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    In the example below, the left square is the original square, while the right square is the new square obtained by this transformation. In the middle square, rows 1 and 2 and rows 3 and 4 have been swapped. The final square on the right is obtained by interchanging columns 1 and 2 and columns 3 and 4 of the middle square.