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  2. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    They are used, to some degree, in most subjects, and have widespread use in the math curriculum where there are two major types. The first type of math worksheet contains a collection of similar math problems or exercises. These are intended to help a student become proficient in a particular mathematical skill that was taught to them in class.

  3. Hopf link - Wikipedia

    en.wikipedia.org/wiki/Hopf_link

    Depending on the relative orientations of the two components the linking number of the Hopf link is ±1. [6]The Hopf link is a (2,2)-torus link [7] with the braid word [8]. The knot complement of the Hopf link is R × S 1 × S 1, the cylinder over a torus. [9]