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  2. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

  3. Timeline for the day of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_for_the_day_of...

    8:46:40: Flight 11 crashes into the north face of the North Tower (1 WTC) of the World Trade Center, between floors 93 and 99. All passengers aboard are instantly killed with an unknown number inside the building. The aircraft enters the tower intact. [1] 8:50–8:54 (approx.): Flight 77 is hijacked above southern Ohio, turning to the southeast ...

  4. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Ukrainian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

  5. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    For 8-bit integers the table of quarter squares will have 2 91=511 entries (one entry for the full range 0..510 of possible sums, the differences using only the first 256 entries in range 0..255) or 2 91=511 entries (using for negative differences the technique of 2-complements and 9-bit masking, which avoids testing the sign of ...

  6. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    An extension of the above example for Orders 8 and 12 First generate a pattern table, where a '1' indicates selecting from the square where the numbers are written in order 1 to n 2 (left-to-right, top-to-bottom), and a '0' indicates selecting from the square where the numbers are written in reverse order n 2 to 1.

  7. Piphilology - Wikipedia

    en.wikipedia.org/wiki/Piphilology

    Piphilology comprises the creation and use of mnemonic techniques to remember many digits of the mathematical constant π. The word is a play on the word "pi" itself and of the linguistic field of philology. There are many ways to memorize π, including the use of piems (a portmanteau, formed by combining pi and po em), which are poems that ...

  8. Timeline of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_September...

    8:42–8:46: United States airspace Flight 175 is hijacked. 8:46:40: North Tower, World Trade Center, New York City, New York: Flight 11 crashes into the North Tower of the World Trade Center between the 93rd and 99th floors. 8:50–8:54: United States airspace Flight 77 is hijacked. 9:03:02 [48] South Tower, World Trade Center, New York City ...

  9. The Falling Man - Wikipedia

    en.wikipedia.org/wiki/The_Falling_Man

    The Falling Man, September 11, 2001. The Falling Man is a photograph taken by Associated Press photographer Richard Drew of a man falling from the World Trade Center during the September 11 attacks in New York City. The unidentified man in the image was trapped on the upper floors of the North Tower, and it is unclear whether he fell while ...

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