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  2. Threefold repetition - Wikipedia

    en.wikipedia.org/wiki/Threefold_repetition

    The rule is also known as repetition of position and, in the USCF rules, as triple occurrence of position. [1] Two positions are by definition "the same" if the same types of pieces occupy the same squares, the same player has the move, the remaining castling rights are the same and the possibility to capture en passant is the same.

  3. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    Digits to the right of it are multiplied by 10 raised to a negative power or exponent. The first position to the right of the separator indicates 10 −1 (0.1), the second position 102 (0.01), and so on for each successive position. As an example, the number 2674 in a base-10 numeral system is: (2 × 10 3) + (6 × 10 2) + (7 × 10 1) + (4 ...

  4. Minkowski's second theorem - Wikipedia

    en.wikipedia.org/wiki/Minkowski's_second_theorem

    A basis of linearly independent lattice vectors b 1, b 2, ..., b n can be defined by g(b j) = λ j.. The lower bound is proved by considering the convex polytope 2n with vertices at ±b j / λ j, which has an interior enclosed by K and a volume which is 2 n /n!λ 1 λ 2...λ n times an integer multiple of a primitive cell of the lattice (as seen by scaling the polytope by λ j along each basis ...

  5. Fisher–Yates shuffle - Wikipedia

    en.wikipedia.org/wiki/Fisher–Yates_shuffle

    Tracing successive positions as just mentioned, there is no difference between π and σ until arriving at position k. But then, under π the element originally at position k is moved to the final position rather than to position l, and the element originally at the final position is moved to position l.

  6. Six nines in pi - Wikipedia

    en.wikipedia.org/wiki/Six_nines_in_pi

    A sequence of six consecutive nines occurs in the decimal representation of the number pi (π), starting at the 762nd decimal place. [ 1 ] [ 2 ] It has become famous because of the mathematical coincidence , and because of the idea that one could memorize the digits of π up to that point, and then suggest that π is rational .

  7. Fermat's principle - Wikipedia

    en.wikipedia.org/wiki/Fermat's_principle

    The construction may be repeated in order to find successive positions of the primary wavefront, and successive points on the ray. The ray direction given by this construction is the radial direction of the secondary wavefront, [ 15 ] and may differ from the normal of the secondary wavefront (cf. Fig. 2 ), and therefore from the normal of the ...

  8. Shannon number - Wikipedia

    en.wikipedia.org/wiki/Shannon_number

    Claude Shannon. The Shannon number, named after the American mathematician Claude Shannon, is a conservative lower bound of the game-tree complexity of chess of 10 120, based on an average of about 10 3 possibilities for a pair of moves consisting of a move for White followed by a move for Black, and a typical game lasting about 40 such pairs of moves.

  9. Theorem of three moments - Wikipedia

    en.wikipedia.org/wiki/Theorem_of_three_moments

    In civil engineering and structural analysis Clapeyron's theorem of three moments (by Émile Clapeyron) is a relationship among the bending moments at three consecutive supports of a horizontal beam.