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  2. Opposite group - Wikipedia

    en.wikipedia.org/wiki/Opposite_group

    g 1, g 2 denotes the ordered pair of the two group elements. *' can be viewed as the naturally induced addition of +. In group theory, a branch of mathematics, an opposite group is a way to construct a group from another group that allows one to define right action as a special case of left action.

  3. Flashcard - Wikipedia

    en.wikipedia.org/wiki/Flashcard

    In this method, flashcards are sorted into groups according to how well the learner knows each one in the Leitner's learning box. The learners then try to recall the solution written on a flashcard. If they succeed, they send the card to the next group. If they fail, they send it back to the first group.

  4. Negative number - Wikipedia

    en.wikipedia.org/wiki/Negative_number

    The laws of arithmetic for negative numbers ensure that the common-sense idea of an opposite is reflected in arithmetic. For example, − ‍ (−3) = 3 because the opposite of an opposite is the original value. Negative numbers are usually written with a minus sign in front. For example, −3 represents a negative quantity with a magnitude of ...

  5. Spaced repetition - Wikipedia

    en.wikipedia.org/wiki/Spaced_repetition

    Spaced repetition is an evidence-based learning technique that is usually performed with flashcards. Newly introduced and more difficult flashcards are shown more frequently, while older and less difficult flashcards are shown less frequently in order to exploit the psychological spacing effect. The use of spaced repetition has been proven to ...

  6. Opposite - Wikipedia

    en.wikipedia.org/wiki/Opposite

    The relationship between opposites is known as opposition. A member of a pair of opposites can generally be determined by the question What is the opposite of X ? The term antonym (and the related antonymy) is commonly taken to be synonymous with opposite, but antonym also has other more restricted meanings. Graded (or gradable) antonyms are ...

  7. Category (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Category_(mathematics)

    For locally small categories, end(a) is a set and forms a monoid under morphism composition. an automorphism if f is both an endomorphism and an isomorphism. The class of automorphisms of a is denoted aut(a). For locally small categories, it forms a group under morphism composition called the automorphism group of a. Every retraction is an ...

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