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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, aligning the rightmost 1 on the C scale with 2 on the LL2 scale, 3 on the C scale lines up with 8 on the LL3 scale. To extract a cube root using a slide rule with only C/D and A/B scales, align 1 on the B cursor with the base number on the A scale (taking care as always to distinguish between the lower and upper halves of the A scale).

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The process for subtracting fractions is, in essence, the same as that of adding them: find a common denominator, and change each fraction to an equivalent fraction with the chosen common denominator. The resulting fraction will have that denominator, and its numerator will be the result of subtracting the numerators of the original fractions.

  4. Help:Displaying a formula - Wikipedia

    en.wikipedia.org/wiki/Help:Displaying_a_formula

    The {} template is available for braces, as shown in the example above. Likewise, {} encloses its parameter inside vertical bars to help with the pipe character conflicting with template syntax. For a single vertical bar, use {}, and for an equal sign, use {}.

  5. Elementary equivalence - Wikipedia

    en.wikipedia.org/wiki/Elementary_equivalence

    More generally, any first-order theory with an infinite model has non-isomorphic, elementarily equivalent models, which can be obtained via the Löwenheim–Skolem theorem. Thus, for example, there are non-standard models of Peano arithmetic , which contain other objects than just the numbers 0, 1, 2, etc., and yet are elementarily equivalent ...

  6. Spreadsheet - Wikipedia

    en.wikipedia.org/wiki/Spreadsheet

    In most implementations, many worksheets may be located within a single spreadsheet. A worksheet is simply a subset of the spreadsheet divided for the sake of clarity. Functionally, the spreadsheet operates as a whole and all cells operate as global variables within the spreadsheet (each variable having 'read' access only except its containing ...

  7. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Inaccurate predictions, rather than being caused by invalid mathematical concepts, imply the need to change the mathematical model used. [103] For example, the perihelion precession of Mercury could only be explained after the emergence of Einstein's general relativity, which replaced Newton's law of gravitation as a better mathematical model ...