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  2. Link (knot theory) - Wikipedia

    en.wikipedia.org/wiki/Link_(knot_theory)

    Frequently the word link is used to describe any submanifold of the sphere diffeomorphic to a disjoint union of a finite number of spheres, .. In full generality, the word link is essentially the same as the word knot – the context is that one has a submanifold M of a manifold N (considered to be trivially embedded) and a non-trivial embedding of M in N, non-trivial in the sense that the 2nd ...

  3. Linking number - Wikipedia

    en.wikipedia.org/wiki/Linking_number

    The linking number was introduced by Gauss in the form of the linking integral. It is an important object of study in knot theory , algebraic topology , and differential geometry , and has numerous applications in mathematics and science , including quantum mechanics , electromagnetism , and the study of DNA supercoiling .

  4. Manipulative (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Manipulative_(mathematics...

    Cuisenaire rods in a staircase arrangement Interlocking "multilink" linking cubes A Polydron icosahedron. In mathematics education, a manipulative is an object which is designed so that a learner can perceive some mathematical concept by manipulating it, hence its name. The use of manipulatives provides a way for children to learn concepts ...

  5. Number sentence - Wikipedia

    en.wikipedia.org/wiki/Number_sentence

    A valid number sentence that is true: 83 + 19 = 102. A valid number sentence that is false: 1 + 1 = 3. A valid number sentence using a 'less than' symbol: 3 + 6 < 10.

  6. Writhe - Wikipedia

    en.wikipedia.org/wiki/Writhe

    In knot theory, the writhe is a property of an oriented link diagram. The writhe is the total number of positive crossings minus the total number of negative crossings. A direction is assigned to the link at a point in each component and this direction is followed all the way around each component. For each crossing one comes across while traveling in this direction, if the strand un

  7. Linkword - Wikipedia

    en.wikipedia.org/wiki/Linkword

    In reality, words often have a different range of meanings, and so the student must learn the complexity or nuance of the new words. For this reason, such techniques may be seen as a useful and powerful way to progress in the language, especially in the early stages, rather than giving a complete understanding.

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