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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. Subject indexing - Wikipedia

    en.wikipedia.org/wiki/Subject_indexing

    Indexes are constructed, separately, on three distinct levels: terms in a document such as a book; objects in a collection such as a library; and documents (such as books and articles) within a field of knowledge. Subject indexing is used in information retrieval especially to create bibliographic indexes to retrieve documents on a particular ...

  4. Raising and lowering indices - Wikipedia

    en.wikipedia.org/wiki/Raising_and_lowering_indices

    It is common convention to use greek indices when writing expressions involving tensors in Minkowski space, while Latin indices are reserved for Euclidean space. Well-formulated expressions are constrained by the rules of Einstein summation : any index may appear at most twice and furthermore a raised index must contract with a lowered index.

  5. Problem of the criterion - Wikipedia

    en.wikipedia.org/wiki/Problem_of_the_criterion

    A third solution is skepticism, which proclaims that since one cannot have an answer to the first set of questions without first answering the second set, and one cannot hope to answer the second set of questions without first knowing the answers to the first set, we are, therefore, unable to answer either. This has the result of us being ...

  6. Vroom–Yetton decision model - Wikipedia

    en.wikipedia.org/wiki/Vroom–Yetton_decision_model

    Leader collects required information from followers, then makes decision alone. Problem or decision may or may not be informed to followers. Here, followers' involvement is just providing information. Consultative Type 1 (CI) Leader shares problem to relevant followers individually and seeks their ideas and suggestions and makes decision alone.

  7. Trial and error - Wikipedia

    en.wikipedia.org/wiki/Trial_and_error

    To find all solutions, one simply makes a note and continues, rather than ending the process, when a solution is found, until all solutions have been tried. To find the best solution, one finds all solutions by the method just described and then comparatively evaluates them based upon some predefined set of criteria, the existence of which is a ...

  8. Index (economics) - Wikipedia

    en.wikipedia.org/wiki/Index_(economics)

    It either understates or overstates cost-of-living increases. This is the limitation of the CPI that is described as the index number problem. There is no theoretically ideal solution to this problem. In practice for retail price indices, the "basket of goods" is updated incrementally every few years to reflect changes.

  9. Sustainability metrics and indices - Wikipedia

    en.wikipedia.org/wiki/Sustainability_metrics_and...

    University of Maryland School of Public Policy professor and former Chief Economist for the World Bank Herman E. Daly (working from theory initially developed by Romanian economist Nicholas Georgescu-Roegen and laid out in his 1971 opus "The Entropy Law and the Economic Process") suggested the following three operational rules defining the condition of ecological (thermodynamic) sustainability: