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  2. Numbered musical notation - Wikipedia

    en.wikipedia.org/wiki/Numbered_musical_notation

    Sometimes a piece is written with multiple time signatures simultaneously. For example, it might specify 4/4 2/4 3/4 5/4, meaning that the length of measures is irregular and can be 4, 2, 3 or 5 quarter-notes. The time signature of the first measure is always specified first, and the others are placed in increasing order of length.

  3. Bemidbar (parashah) - Wikipedia

    en.wikipedia.org/wiki/Bemidbar_(parashah)

    "Look toward heaven and count the stars, if you are able to count them." And He added, "So shall your offspring be."(Genesis 15:5.). Bemidbar, BeMidbar, B'midbar, Bamidbar, or Bamidbor (בְּמִדְבַּר ‎—Hebrew for "in the wilderness of" [Sinai], the fifth overall and first distinctive word in the parashah), is the 34th weekly Torah portion (פָּרָשָׁה ‎, parashah) in the ...

  4. Schoenflies notation - Wikipedia

    en.wikipedia.org/wiki/Schoenflies_notation

    The space groups with given point group are numbered by 1, 2, 3, ... (in the same order as their international number) and this number is added as a superscript to the Schönflies symbol for the corresponding point group. For example, groups numbers 3 to 5 whose point group is C 2 have Schönflies symbols C 1 2, C 2 2, C 3 2.

  5. Tetractys - Wikipedia

    en.wikipedia.org/wiki/Tetractys

    The tetractys. The tetractys (Greek: τετρακτύς), or tetrad, [1] or the tetractys of the decad [2] is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number.

  6. Bhāskara I - Wikipedia

    en.wikipedia.org/wiki/Bhāskara_I

    Bhāskara (c. 600 – c. 680) (commonly called Bhāskara I to avoid confusion with the 12th-century mathematician Bhāskara II) was a 7th-century Indian mathematician and astronomer who was the first to write numbers in the Hindu–Arabic decimal system with a circle for the zero, and who gave a unique and remarkable rational approximation of the sine function in his commentary on Aryabhata's ...

  7. Cistercian numerals - Wikipedia

    en.wikipedia.org/wiki/Cistercian_numerals

    For example, the digits shown here for 3 and 4 were in some manuscripts swapped with those for 7 and 8, and the 5's may be written with a lower dot (꜎ etc.), with a short vertical stroke in place of the dot, or even with a triangle joining to the stave, which in other manuscripts indicated a 9.) [13] [1]

  8. Centered square number - Wikipedia

    en.wikipedia.org/wiki/Centered_square_number

    Hence all centered square numbers and their divisors end with digit 1 or 5 in base 6, 8, and 12. Every centered square number except 1 is the hypotenuse of a Pythagorean triple (3-4-5, 5-12-13, 7-24-25, ...). This is exactly the sequence of Pythagorean triples where the two longest sides differ by 1. (Example: 5 2 + 12 2 = 13 2.) This is not to ...

  9. Narayana number - Wikipedia

    en.wikipedia.org/wiki/Narayana_number

    N(4, 4) = 1 path with 4 peaks: The sum of N ⁡ ( 4 , k ) {\displaystyle \operatorname {N} (4,k)} is 1 + 6 + 6 + 1 = 14, which is the 4th Catalan number, C 4 {\displaystyle C_{4}} . This sum coincides with the interpretation of Catalan numbers as the number of monotonic paths along the edges of an n × n {\displaystyle n\times n} grid that do ...