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  2. OpenFormula - Wikipedia

    en.wikipedia.org/wiki/OpenFormula

    This allows spreadsheet applications to add new functions, without interfering with current standard functions, future standard functions, or functions defined by other applications. As a result, different applications can add new functions without interfering with others; once a consensus arises about the new function, it can be standardized.

  3. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS.It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA).

  4. Upside-down question and exclamation marks - Wikipedia

    en.wikipedia.org/wiki/Upside-down_question_and...

    Outside of the Spanish-speaking world, John Wilkins proposed using the upside-down exclamation mark "¡" as a symbol at the end of a sentence to denote irony in 1668. He was one of many, including Desiderius Erasmus , who felt there was a need for such a punctuation mark, but Wilkins' proposal, like the other attempts, failed to take hold.

  5. Step function - Wikipedia

    en.wikipedia.org/wiki/Step_function

    The product of a step function with a number is also a step function. As such, the step functions form an algebra over the real numbers. A step function takes only a finite number of values. If the intervals , for =,, …, in the above definition of the step function are disjoint and their union is the real line, then () = for all .

  6. Microsoft Office - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Office

    Microsoft Office 1.5 for Mac was released in 1991 and included the updated Excel 3.0, the first application to support Apple's System 7 operating system. [176] Microsoft Office 3.0 for Mac was released in 1992 and included Word 5.0, Excel 4.0, PowerPoint 3.0 and Mail Client. Excel 4.0 was the first application to support new AppleScript. [176]

  7. Heaviside step function - Wikipedia

    en.wikipedia.org/wiki/Heaviside_step_function

    The Heaviside step function, or the unit step function, usually denoted by H or θ (but sometimes u, 1 or 𝟙), is a step function named after Oliver Heaviside, the value of which is zero for negative arguments and one for positive arguments. Different conventions concerning the value H(0) are in use.

  8. Ñ - Wikipedia

    en.wikipedia.org/wiki/Ñ

    Ñ, or ñ (Spanish: eñe, ⓘ), is a letter of the modern Latin alphabet, formed by placing a tilde (also referred to as a virgulilla in Spanish, in order to differentiate it from other diacritics, which are also called tildes) on top of an upper- or lower-case n . [1]

  9. Autonomous communities of Spain - Wikipedia

    en.wikipedia.org/wiki/Autonomous_communities_of...

    Spain is a diverse country made up of several different regions with varying economic and social structures, as well as different languages and historical, political and cultural traditions. [ 11 ] [ 12 ] While the entire Spanish territory was united under one crown in 1479, this was not a process of national homogenization or amalgamation.