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  2. The three Rs - Wikipedia

    en.wikipedia.org/wiki/The_three_Rs

    The three Rs [1] are three basic skills taught in schools: reading, writing and arithmetic", Reading, wRiting, and ARithmetic [2] or Reckoning. The phrase appears to have been coined at the beginning of the 19th century.

  3. Sino-Vietnamese vocabulary - Wikipedia

    en.wikipedia.org/wiki/Sino-Vietnamese_vocabulary

    Writing Sino-Vietnamese words with the Vietnamese alphabet causes some confusion about the origins of some terms, due to the large number of homophones in Sino-Vietnamese. For example, both 明 (bright) and 冥 (dark) are read as minh , thus the word "minh" has two contradictory meanings: bright and dark (although the "dark" meaning is now ...

  4. Penmanship - Wikipedia

    en.wikipedia.org/wiki/Penmanship

    Penmanship is the technique of writing with the hand using a writing instrument. Today, this is most commonly done with a pen, or pencil, but throughout history has included many different implements. The various generic and formal historical styles of writing are called "hands" while an individual's style of penmanship is referred to as ...

  5. List of writing systems - Wikipedia

    en.wikipedia.org/wiki/List_of_writing_systems

    Writing systems are used to record human language, and may be classified according to certain common features.. The usual name of the script is given first; the name of the languages in which the script is written follows (in brackets), particularly in the case where the language name differs from the script name.

  6. Figure-eight knot (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Figure-eight_knot...

    Figure-eight knot of practical knot-tying, with ends joined. In knot theory, a figure-eight knot (also called Listing's knot [1]) is the unique knot with a crossing number of four. This makes it the knot with the third-smallest possible crossing number, after the unknot and the trefoil knot. The figure-eight knot is a prime knot.

  7. Knot (mathematics) - Wikipedia

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

    A framed knot is the extension of a tame knot to an embedding of the solid torus D 2 × S 1 in S 3. The framing of the knot is the linking number of the image of the ribbon I × S 1 with the knot. A framed knot can be seen as the embedded ribbon and the framing is the (signed) number of twists. [8] This definition generalizes to an analogous ...

  8. 71 knot - Wikipedia

    en.wikipedia.org/wiki/71_knot

    In knot theory, the 7 1 knot, also known as the septoil knot, the septafoil knot, or the (7, 2)-torus knot, is one of seven prime knots with crossing number seven. It is the simplest torus knot after the trefoil and cinquefoil .

  9. Knot tabulation - Wikipedia

    en.wikipedia.org/wiki/Knot_tabulation

    As of May 2008, all prime knots up to 16 crossings have been tabulated. [1] The major challenge of the process is that many apparently different knots may actually be different geometrical presentations of the same topological entity, and that proving or disproving knot equivalence is much more difficult than it at first seems.

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