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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    HTML 4.01 Specification since PDF 1.5; HTML 2.0 since 1.2 Forms Data Format (FDF) based on PDF, uses the same syntax and has essentially the same file structure, but is much simpler than PDF since the body of an FDF document consists of only one required object. Forms Data Format is defined in the PDF specification (since PDF 1.2).

  3. PDF/A - Wikipedia

    en.wikipedia.org/wiki/PDF/A

    PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...

  4. History of PDF - Wikipedia

    en.wikipedia.org/wiki/History_of_PDF

    1.7 Adobe Extension Level 1 [23] 2008: XFA 2.5 (Extensions Level 1) and XFA 2.6 (Extensions Level 2) (XFA 2.6 defined for example the following features: XFA Secure submit, new profile - XFA Foreground (XFAF) - each page of the XFA form overlays a PDF background, etc.) [24] 8.1 1.7 Adobe Extension Level 3: 2008

  5. Distribution of the product of two random variables - Wikipedia

    en.wikipedia.org/wiki/Distribution_of_the...

    A product distribution is a probability distribution constructed as the distribution of the product of random variables having two other known distributions. Given two statistically independent random variables X and Y, the distribution of the random variable Z that is formed as the product = is a product distribution.

  6. Centered pentagonal number - Wikipedia

    en.wikipedia.org/wiki/Centered_pentagonal_number

    In mathematics, a centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. [1] The centered pentagonal number for n is given by the formula = +,

  7. Pentaamine (dinitrogen)ruthenium (II) chloride - Wikipedia

    en.wikipedia.org/wiki/Pentaamine(dinitrogen...

    Pentaamine(nitrogen)ruthenium(II) chloride is an inorganic compound with the formula [Ru(NH 3) 5 (N 2)]Cl 2. It is a nearly white solid, but its solutions are yellow. The cationic complex is of historic significance as the first compound with N 2 bound to a metal center. [1] [2] [Ru(NH 3) 5 (N 2)] 2+ adopts an octahedral structure with C 4v ...

  8. Opinion polling for the 2015 Canadian federal election

    en.wikipedia.org/wiki/Opinion_polling_for_the...

    Graphical summary. Evolution of voting intentions according to polls conducted during the pre-campaign period of the 2015 Canadian federal election, graphed from the data in the table below.

  9. Champernowne constant - Wikipedia

    en.wikipedia.org/wiki/Champernowne_constant

    The definition of the Champernowne constant immediately gives rise to an infinite series representation involving a double sum, = = = (+), where () = = is the number of digits between the decimal point and the first contribution from an n-digit base-10 number; these expressions generalize to an arbitrary base b by replacing 10 and 9 with b and b − 1 respectively.