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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Interactive Forms is a mechanism to add forms to the PDF file format. PDF currently supports two different methods for integrating data and PDF forms. Both formats today coexist in the PDF specification: [38] [53] [54] [55] AcroForms (also known as Acrobat forms), introduced in the PDF 1.2 format specification and included in all later PDF ...

  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

    JPEG 2000; enhanced support for embedding and playback of multimedia; object streams; cross reference streams; XML Forms Data Format (XFDF) for interactive form submission (replaced the XML format in PDF 1.4); support for forms, rich text elements and attributes based on Adobe's XML Forms Architecture (XFA) 2.02 (which defines only static XFA ...

  5. Comparison of e-book formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_e-book_formats

    Rich Text Format is a document file format that is supported by many e-book readers. Its advantages as an e-book format are that it is widely supported, and it can be reflowed. It can be easily edited. It can be easily converted to other e-book formats, increasing its support.

  6. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Because of the rules of division of signed numbers (which states in part that negative divided by positive is negative), − ⁠ 1 / 2 ⁠, ⁠ −1 / 2 ⁠ and ⁠ 1 / −2 ⁠ all represent the same fraction – negative one-half. And because a negative divided by a negative produces a positive, ⁠ −1 / −2 ⁠ represents positive one-half.

  7. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    It has the symbols I, V, X, L, C, D, M as its basic numerals to represent the numbers 1, 5, 10, 50, 100, 500, and 1000. [33] A numeral system is positional if the position of a basic numeral in a compound expression determines its value. Positional numeral systems have a radix that acts as a multiplicand of the different positions. For each ...

  8. Data compression ratio - Wikipedia

    en.wikipedia.org/wiki/Data_compression_ratio

    Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:

  9. Floppy disk format - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk_format

    Sometimes disks may use a more exotic file system. SSDD originally referred to Single Sided, Double Density, a format of (usually 5 + 1 ⁄ 4-inch) floppy disks which could typically hold 35-40 tracks of nine 512-byte (or 18 256-byte) sectors each. Only one side of the disc was used, although some users did discover that punching additional ...