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  2. Inventor's paradox - Wikipedia

    en.wikipedia.org/wiki/Inventor's_paradox

    In this form, the example can be solved by most without the use of a calculator. [3] If one notices the problem's lowest and highest numbers (1 + 99) sum to 100, and that the next pair of lowest and highest numbers (2 + 98) also sum to 100, they'll also realize that all 49 numbers are matching pairs that each sum to 100, except for the single ...

  3. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    Every terminating decimal representation can be written as a decimal fraction, a fraction whose denominator is a power of 10 (e.g. 1.585 = ⁠ 1585 / 1000 ⁠); it may also be written as a ratio of the form ⁠ k / 2 n ·5 m ⁠ (e.g. 1.585 = ⁠ 317 / 2 3 ·5 2 ⁠).

  4. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    An irreducible fraction (or fraction in lowest terms, simplest form or reduced fraction) is a fraction in which the numerator and denominator are integers that have no other common divisors than 1 (and −1, when negative numbers are considered). [1]

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    For example, is not in lowest terms because both 3 and 9 can be exactly divided by 3. In contrast, is in lowest terms—the only positive integer that goes into both 3 and 8 evenly is 1. Using these rules, we can show that ⁠ 5 / 10 ⁠ = ⁠ 1 / 2 ⁠ = ⁠ 10 / 20 ⁠ = ⁠ 50 / 100 ⁠, for example.

  6. 2-satisfiability - Wikipedia

    en.wikipedia.org/wiki/2-satisfiability

    The "2" in this name stands for the number of literals per clause, and "CNF" stands for conjunctive normal form, a type of Boolean expression in the form of a conjunction of disjunctions. [1] They are also called Krom formulas, after the work of UC Davis mathematician Melven R. Krom, whose 1967 paper was one of the earliest works on the 2 ...

  7. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The uniqueness conjecture for Markov numbers [158] that every Markov number is the largest number in exactly one normalized solution to the Markov Diophantine equation. Pillai's conjecture : for any A , B , C {\displaystyle A,B,C} , the equation A x m − B y n = C {\displaystyle Ax^{m}-By^{n}=C} has finitely many solutions when m , n ...

  8. Dynamic programming - Wikipedia

    en.wikipedia.org/wiki/Dynamic_programming

    The values V i at earlier times i = n −1, n − 2, ..., 2, 1 can be found by working backwards, using a recursive relationship called the Bellman equation. For i = 2, ..., n , V i −1 at any state y is calculated from V i by maximizing a simple function (usually the sum) of the gain from a decision at time i − 1 and the function V i at the ...

  9. Continued fraction - Wikipedia

    en.wikipedia.org/wiki/Continued_fraction

    In number theory the standard unqualified use of the term continued fraction refers to the special case where all numerators are 1, and is treated in the article Simple continued fraction. The present article treats the case where numerators and denominators are sequences { a i } , { b i } {\displaystyle \{a_{i}\},\{b_{i}\}} of constants or ...