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  2. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Singh cites Pingala's cryptic formula misrau cha ("the two are mixed") and scholars who interpret it in context as saying that the number of patterns for m beats (F m+1) is obtained by adding one [S] to the F m cases and one [L] to the F m−1 cases. [12] Bharata Muni also expresses knowledge of the sequence in the Natya Shastra (c. 100 BC–c ...

  3. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    The first character group is a number representing the heater voltage rounded to the nearest whole number; 0 indicates a cold-cathode tube. [1] One or two letters assigned to the devices in order of development. A single numeral that represents the number of active elements in the tube. Suffix letters distinguish revisions or variants:

  4. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    Werner noted only two isomers (fac- and mer-) of the complex [CrCl 3 (NH 3) 3] could be formed, and concluded the ligands must be arranged around the metal ion at the vertices of an octahedron. Ammonia forms 1:1 adducts with a variety of Lewis acids such as I 2 , phenol , and Al(CH 3 ) 3 .

  5. Carl Friedrich Gauss - Wikipedia

    en.wikipedia.org/wiki/Carl_Friedrich_Gauss

    This is an accepted version of this page This is the latest accepted revision, reviewed on 28 December 2024. German mathematician, astronomer, geodesist, and physicist (1777–1855) "Gauss" redirects here. For other uses, see Gauss (disambiguation). Carl Friedrich Gauss Portrait by Christian Albrecht Jensen, 1840 (copy from Gottlieb Biermann, 1887) Born Johann Carl Friedrich Gauss (1777-04-30 ...