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  2. Ordinal numeral - Wikipedia

    en.wikipedia.org/wiki/Ordinal_numeral

    Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced. For example: 5 November 1605 (pronounced "the fifth of November ...

  3. Order of approximation - Wikipedia

    en.wikipedia.org/wiki/Order_of_approximation

    First-order approximation is the term scientists use for a slightly better answer. [3] Some simplifying assumptions are made, and when a number is needed, an answer with only one significant figure is often given ("the town has 4 × 10 3, or four thousand, residents"). In the case of a first-order approximation, at least one number given is exact.

  4. Second-order logic - Wikipedia

    en.wikipedia.org/wiki/Second-order_logic

    A (existential second-order) formula is one additionally having some existential quantifiers over second order variables, i.e. …, where is a first-order formula. The fragment of second-order logic consisting only of existential second-order formulas is called existential second-order logic and abbreviated as ESO, as , or even as ∃SO.

  5. First-order upwind scheme - Wikipedia

    en.wikipedia.org/wiki/Upwind_scheme

    A Taylor series analysis of the upwind scheme discussed above will show that it is first-order accurate in space and time. Modified wavenumber analysis shows that the first-order upwind scheme introduces severe numerical diffusion /dissipation in the solution where large gradients exist due to necessity of high wavenumbers to represent sharp ...

  6. Ordinal number - Wikipedia

    en.wikipedia.org/wiki/Ordinal_number

    Cantor proved that the cardinality of the second number class is the first uncountable cardinality. [12] Cantor's second theorem becomes: If P ′ is countable, then there is a countable ordinal α such that P (α) = ∅. Its proof uses proof by contradiction. Let P ′ be countable, and assume there is no such α. This assumption produces two ...

  7. Ordinal indicator - Wikipedia

    en.wikipedia.org/wiki/Ordinal_indicator

    The exception is pertama, which means "first". Numbers in Filipino are preceded by the ordinal prefix ika-or pang-(the latter subject to sandhi; for example, ika-7 or pam-7 "seventh"). The exception is una, which means "first". In Chinese and Japanese, an ordinal number is prefixed by 第 dì / dai; for example: 第一 "first", 第二 "second".

  8. Order statistic - Wikipedia

    en.wikipedia.org/wiki/Order_statistic

    The first order statistic ... In this particular case, a better confidence interval for the median is the one delimited by the 2nd and 5th order statistics, which ...

  9. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    Order of operations. In mathematics and computer programming, the order of operations is a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression. These rules are formalized with a ranking of the operations.