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  2. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    This is also known as a falling factorial or backward factorial, and the () notation is a Pochhammer symbol. [96] Falling factorials count the number of different sequences of n {\displaystyle n} distinct items that can be drawn from a universe of x {\displaystyle x} items. [ 97 ]

  3. 0 - Wikipedia

    en.wikipedia.org/wiki/0

    Zero was not treated as a number at that time, but as a "vacant position". [39] Qín Jiǔsháo's 1247 Mathematical Treatise in Nine Sections is the oldest surviving Chinese mathematical text using a round symbol ‘〇’ for zero. [40] The origin of this symbol is unknown; it may have been produced by modifying a square symbol. [41]

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    For most symbols, the entry name is the corresponding Unicode symbol. So, for searching the entry of a symbol, it suffices to type or copy the Unicode symbol into the search textbox. Similarly, when possible, the entry name of a symbol is also an anchor, which allows linking easily from another Wikipedia article. When an entry name contains ...

  5. Falling and rising factorials - Wikipedia

    en.wikipedia.org/wiki/Falling_and_rising_factorials

    In this article, the symbol () is used to represent the falling factorial, and the symbol () is used for the rising factorial. These conventions are used in combinatorics , [ 4 ] although Knuth 's underline and overline notations x n _ {\displaystyle x^{\underline {n}}} and x n ¯ {\displaystyle x^{\overline {n}}} are increasingly popular.

  6. Symbols for zero - Wikipedia

    en.wikipedia.org/wiki/Symbols_for_zero

    An alternative, the slashed zero (looking similar to the letter O except for the slash), was primarily used in hand-written coding sheets before transcription to punched cards or tape, and is also used in old-style ASCII graphic sets descended from the default typewheel on the Teletype Model 33 ASR.

  7. Tom Brady Wears $740,000 Watch as He Makes His Super Bowl ...

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    Tom Brady has stepped out in style! The former NFL quarterback, 47, arrived for his commentary debut at the 2025 Super Bowl in New Orleans on Sunday, Feb. 9 with a major piece of bling on his ...

  8. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    "current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics) Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten

  9. Kate Middleton Stops Royal Convoy to Speak to Young Girl ...

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    Related: Kate Middleton Was 'Relaxed and Welcoming’ During Children’s Hospice Visit: She ‘Stayed Much Longer Than We Expected’ (Exclusive) Her husband Dan adds, “It feels like you are ...