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  2. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    3. The equality of the volumes of two tetrahedra of equal bases and equal altitudes. 4. Problem of the straight line as the shortest distance between two points. 5. Lie's concept of a continuous group of transformations without the assumption of the differentiability of the functions defining the group. 6. Mathematical treatment of the axioms ...

  3. 27 (number) - Wikipedia

    en.wikipedia.org/wiki/27_(number)

    Twenty-seven is the cube of 3, or the 2nd tetration of 3: 2 3 = 3 3 = 3 × 3 × 3. It is divisible by the number of prime numbers below it ().. The first non-trivial decagonal number is 27.

  4. Numeral prefix - Wikipedia

    en.wikipedia.org/wiki/Numeral_prefix

    Words in the cardinal catgegory are cardinal numbers, such as the English one, two, three, which name the count of items in a sequence. The multiple category are adverbial numbers, like the English once , twice , thrice , that specify the number of events or instances of otherwise identical or similar items.

  5. 28 (number) - Wikipedia

    en.wikipedia.org/wiki/28_(number)

    [3] Twenty-eight is a harmonic divisor number, [4] a happy number, [5] the 7th triangular number, [6] a hexagonal number, [7] a Leyland number of the second kind [8] (), and a centered nonagonal number. [9] It appears in the Padovan sequence, preceded by the terms 12, 16, 21 (it is the sum of the first two of these). [10]

  6. List of polygons - Wikipedia

    en.wikipedia.org/wiki/List_of_polygons

    These segments are called its edges or sides, and the points where two of the edges meet are the polygon's vertices (singular: vertex) or corners. The word polygon comes from Late Latin polygōnum (a noun), from Greek πολύγωνον ( polygōnon/polugōnon ), noun use of neuter of πολύγωνος ( polygōnos/polugōnos , the masculine ...

  7. Latin numerals - Wikipedia

    en.wikipedia.org/wiki/Latin_Numerals

    The accusative forms dŭōs m., dŭās f., the genitive dŭom, classical dŭōrum m./n., dŭārum f., and the dative/ablative dŭōbus m./n., dŭābus f., are original Latin formations replicating nominal declension patterns; at times, duo stands in for other case forms, especially when combined with invariant numerals, e. g. duo et vīgintī ...

  8. Points of the compass - Wikipedia

    en.wikipedia.org/wiki/Points_of_the_compass

    Points remained the standard unit until switching to the three-figure degree method. These points were also used for relative measurement, so that an obstacle might be noted as 'two points off the starboard bow', meaning two points clockwise of straight ahead, 22 + 1 ⁄ 2 ° [9] This relative measurement may still be used in shorthand on ...

  9. Number Pieces - Wikipedia

    en.wikipedia.org/wiki/Number_Pieces

    This piece may be performed with Twenty-Eight (Fifty-Four), Twenty-Nine (Fifty-Five), or both (Eighty-Three). All time brackets contain a single sound. The first violin starts the videoclock. Twenty-Eight: 3 flutes, 1 alto flute, 4 clarinets, 3 oboes, 1 English horn, 3 bassoons, 1 contrabassoon, 4 trumpets, 4 horns, 2 trombones, 1 bass trombone ...