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  2. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards , matching games , practice electronic assessments , and live quizzes.

  3. Structuration theory - Wikipedia

    en.wikipedia.org/wiki/Structuration_theory

    Sociologist Anthony Giddens adopted a post-empiricist frame for his theory, as he was concerned with the abstract characteristics of social relations. [according to whom?] This leaves each level more accessible to analysis via the ontologies which constitute the human social experience: space and time ("and thus, in one sense, 'history'.") [1]: 3 His aim was to build a broad social theory ...

  4. Structure and agency - Wikipedia

    en.wikipedia.org/wiki/Structure_and_agency

    Bourdieu's work attempts to reconcile structure and agency, as external structures are internalized into the habitus while the actions of the agent externalize interactions between actors into the social relationships in the field. Bourdieu's theory, therefore, is a dialectic between "externalizing the internal", and "internalizing the external".

  5. Auxiliary sciences of history - Wikipedia

    en.wikipedia.org/wiki/Auxiliary_sciences_of_history

    Auxiliary (or ancillary) sciences of history are scholarly disciplines which help evaluate and use historical sources and are seen as auxiliary for historical research. [1] [page needed] Many of these areas of study, classification and analysis were originally developed between the 16th and 19th centuries by antiquaries, and would then have been regarded as falling under the broad heading of ...

  6. Barriers to entry - Wikipedia

    en.wikipedia.org/wiki/Barriers_to_entry

    An ancillary barrier to entry is a cost that does not constitute a barrier to entry by itself, but reinforces other barriers to entry if they are present. [ 1 ] [ 7 ] An antitrust barrier to entry is "a cost that delays entry and thereby reduces social welfare relative to immediate but equally costly entry". [ 1 ]

  7. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    For example, NASA's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra. [2] Scale diagram of Earth's shadow, showing how the umbral cone extends beyond the orbit of the Moon (The Moon is indicated by the yellow dot.) Earth's umbra, as seen during a partial lunar eclipse

  8. Structural system - Wikipedia

    en.wikipedia.org/wiki/Structural_system

    Commonly used structures can be classified into five major categories, depending on the type of primary stress that may arise in the members of the structures under major design loads. However any two or more of the basic structural types described in the following may be combined in a single structure, such as a building or a bridge in order ...

  9. Proportion (architecture) - Wikipedia

    en.wikipedia.org/wiki/Proportion_(architecture)

    The principles of measurement units digit, foot, and cubit also came from the dimensions of a Vitruvian Man. More specifically, Vitruvius used the total height of 6 feet of a person, and each part of the body takes up a different ratio. For example, the face is about 1/10 of the total height, and the head is about 1/8 of the total height. [3]