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  2. IBM Personal Computer XT - Wikipedia

    en.wikipedia.org/wiki/IBM_Personal_Computer_XT

    The IBM Personal Computer XT (model 5160, often shortened to PC/XT) is the second computer in the IBM Personal Computer line, released on March 8, 1983. [1] Except for the addition of a built-in hard drive and extra expansion slots, it is very similar to the original IBM PC model 5150 from 1981.

  3. Lotus 1-2-3 - Wikipedia

    en.wikipedia.org/wiki/Lotus_1-2-3

    Lotus 1-2-3 is a discontinued spreadsheet program from Lotus Software (later part of IBM).It was the first killer application of the IBM PC, was hugely popular in the 1980s, and significantly contributed to the success of IBM PC-compatibles in the business market.

  4. T-matrix method - Wikipedia

    en.wikipedia.org/wiki/T-matrix_method

    The standard way to calculate the T-matrix is the null-field method, which relies on the Stratton–Chu equations. [6] They basically state that the electromagnetic fields outside a given volume can be expressed as integrals over the surface enclosing the volume involving only the tangential components of the fields on the surface.

  5. Template:History of technology - Wikipedia

    en.wikipedia.org/wiki/Template:History_of_technology

    To change this template's initial visibility, the |state= parameter may be used: {{History of technology | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{History of technology | state = expanded}} will show the template expanded, i.e. fully visible.

  6. Template:Theories of History - Wikipedia

    en.wikipedia.org/wiki/Template:Theories_of_History

    Download QR code; Print/export ... This template links to articles about theories of history.

  7. Dynamic lot-size model - Wikipedia

    en.wikipedia.org/wiki/Dynamic_lot-size_model

    There is a setup cost s t incurred for each order and there is an inventory holding cost i t per item per period (s t and i t can also vary with time if desired). The problem is how many units x t to order now to minimize the sum of setup cost and inventory cost.

  8. Genealogical numbering systems - Wikipedia

    en.wikipedia.org/wiki/Genealogical_numbering_systems

    In order to readily have the generation stated for a certain person, the Ahnentafel numbering may be preceded by the generation. This method's usefulness becomes apparent when applied further back in the generations: e.g. 08-146, is a male preceding the subject by 7 (8-1) generations. This ancestor was the father of a woman (146/2=73) (in the ...

  9. Timeline of numerical analysis after 1945 - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_numerical...

    Successive over-relaxation was devised simultaneously by D.M. Young Jr. [7] and by H. Frankel in 1950.; Hestenes, Stiefel, and Lanczos, all from the Institute for Numerical Analysis at the National Bureau of Standards, initiate the development of Krylov subspace iteration methods.