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  2. Equivalence of metrics - Wikipedia

    en.wikipedia.org/wiki/Equivalence_of_metrics

    Two metrics and on X are strongly or bilipschitz equivalent or uniformly equivalent if and only if there exist positive constants and such that, for every ,, (,) (,) (,).In contrast to the sufficient condition for topological equivalence listed above, strong equivalence requires that there is a single set of constants that holds for every pair of points in , rather than potentially different ...

  3. Album-equivalent unit - Wikipedia

    en.wikipedia.org/wiki/Album-equivalent_unit

    The standard of an album-equivalent unit in the United States, according to the RIAA. The album-equivalent unit, or album equivalent, [1] is a measurement unit in music industry to define the consumption of music that equals the purchase of one album copy. [2] [3] This consumption includes streaming and song downloads in addition to traditional ...

  4. Category:Equivalence (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Category:Equivalence...

    Elementary equivalence; Equals sign; Equality (mathematics) Equality operator; Equipollence (geometry) Equivalence (measure theory) Equivalence class; Equivalence of categories; Equivalence of metrics; Equivalence relation; Equivalence test; Equivalent definitions of mathematical structures; Equivalent infinitesimal; Equivalent latitude ...

  5. MP3 - Wikipedia

    en.wikipedia.org/wiki/MP3

    The Moving Picture Experts Group (MPEG) designed MP3 as part of its MPEG-1, and later MPEG-2, standards.MPEG-1 Audio (MPEG-1 Part 3), which included MPEG-1 Audio Layer I, II, and III, was approved as a committee draft for an ISO/IEC standard in 1991, [14] [15] finalized in 1992, [16] and published in 1993 as ISO/IEC 11172-3:1993. [7]

  6. Equivalence class (music) - Wikipedia

    en.wikipedia.org/wiki/Equivalence_class_(music)

    In music theory, equivalence class is an equality or equivalence between properties of sets (unordered) or twelve-tone rows (ordered sets). A relation rather than an operation, it may be contrasted with derivation . [ 1 ] "

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity.

  8. List of best-selling albums - Wikipedia

    en.wikipedia.org/wiki/List_of_best-selling_albums

    This is a list of the world's best-selling albums of recorded music in physical mediums, such as vinyl, audio cassettes or compact discs. To appear on the list, the figure must have been published by a reliable source and the album must have sold at least 20 million copies and certified at least 10 million units (the equivalent of a diamond ...

  9. YouTube Music - Wikipedia

    en.wikipedia.org/wiki/YouTube_Music

    YouTube Music is a music streaming service developed by the American video platform YouTube, a subsidiary of Alphabet's Google.The service is designed with an interface that allows users to simultaneously explore music audios and music videos from YouTube-based genres, playlists and recommendations.