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  2. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also ...

  3. Table of mathematical symbols by introduction date - Wikipedia

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

    unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) : 1670 (with the horizontal bar over the inequality sign, rather than below it) ...

  4. Date rolling - Wikipedia

    en.wikipedia.org/wiki/Date_rolling

    Many institutions have month-end accounting procedures that necessitate this. Previous business day: the payment date is rolled to the previous business day. Modified previous business day: the payment date is rolled to the previous business day unless doing so would cause the payment to be in the previous calendar month, in which case the ...

  5. Broadcast calendar - Wikipedia

    en.wikipedia.org/wiki/Broadcast_calendar

    Broadcast calendar months thus have either 28 or 35 days. The key link between the broadcast and Gregorian calendars is that the first week of every broadcast month always contains the Gregorian calendar first of the month. For example, if January 1 falls on a Saturday, then the broadcast calendar year would begin on the preceding Monday ...

  6. Arithmetic progression - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_progression

    Proof without words of the arithmetic progression formulas using a rotated copy of the blocks. An arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference from any succeeding term to its preceding term remains constant throughout the sequence. The constant difference is called common difference of that ...

  7. Post hoc ergo propter hoc - Wikipedia

    en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc

    The form of the post hoc fallacy is expressed as follows: . A occurred, then B occurred.; Therefore, A caused B. When B is undesirable, this pattern is often combined with the formal fallacy of denying the antecedent, assuming the logical inverse holds: believing that avoiding A will prevent B.

  8. Equation - Wikipedia

    en.wikipedia.org/wiki/Equation

    The term "ordinary" is used in contrast with the term partial differential equation, which may be with respect to more than one independent variable. Linear differential equations, which have solutions that can be added and multiplied by coefficients, are well-defined and understood, and exact closed-form solutions are obtained.

  9. Glossary of set theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_set_theory

    A⊧φ means that the formula φ holds in the model A ⊩ The forcing relation ≺ An elementary embedding ⊥ The false symbol p⊥q means that p and q are incompatible elements of a partial order 0 # zero sharp, the set of true formulas about indiscernibles and order-indiscernibles in the constructible universe 0 † zero dagger, a certain ...