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  2. Tabla - Wikipedia

    en.wikipedia.org/wiki/Tabla

    A tabla [nb 1] is a pair of hand drums from the Indian subcontinent. Since the 18th century, it has been the principal percussion instrument in Hindustani classical music , [ 3 ] where it may be played solo, as an accompaniment with other instruments and vocals, or as a part of larger ensembles.

  3. Dmitri Mendeleev - Wikipedia

    en.wikipedia.org/wiki/Dmitri_Mendeleev

    Dmitri Ivanovich Mendeleev (/ ˌ m ɛ n d əl ˈ eɪ ə f / MEN-dəl-AY-əf; [2] [b] [a] 8 February [O.S. 27 January] 1834 – 2 February [O.S. 20 January] 1907) was a Russian chemist known for formulating the periodic law and creating a version of the periodic table of elements.

  4. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Cycles of the unit digit of multiples of integers ending in 1, 3, 7 and 9 (upper row), and 2, 4, 6 and 8 (lower row) on a telephone keypad. Figure 1 is used for multiples of 1, 3, 7, and 9. Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5.

  5. History of the periodic table - Wikipedia

    en.wikipedia.org/wiki/History_of_the_periodic_table

    This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...

  6. Tabula recta - Wikipedia

    en.wikipedia.org/wiki/Tabula_recta

    Tabula recta. In cryptography, the tabula recta (from Latin tabula rēcta) is a square table of alphabets, each row of which is made by shifting the previous one to the left.. The term was invented by the German author and monk Johannes Trithemius [1] in 1508, and used in his Trithemius ciph

  7. Cayley table - Wikipedia

    en.wikipedia.org/wiki/Cayley_table

    The group {1, −1} above and the cyclic group of order 3 under ordinary multiplication are both examples of abelian groups, and inspection of the symmetry of their Cayley tables verifies this. In contrast, the smallest non-abelian group, the dihedral group of order 6 , does not have a symmetric Cayley table.

  8. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    1 See also. 2 Sources. 3 External links. Toggle the table of contents. ... 1718 (deriving from horizontal fraction bar, invented by Abu Bakr al-Hassar in the 12th ...

  9. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    In the Etruscan system, the symbol 1 was a single vertical mark, the symbol 10 was two perpendicularly crossed tally marks, and the symbol 100 was three crossed tally marks (similar in form to a modern asterisk *); while 5 (an inverted V shape) and 50 (an inverted V split by a single vertical mark) were perhaps derived from the lower halves of ...