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  2. Quadratic reciprocity - Wikipedia

    en.wikipedia.org/wiki/Quadratic_reciprocity

    Quadratic Reciprocity (Legendre's statement). If p or q are congruent to 1 modulo 4, then: is solvable if and only if is solvable. If p and q are congruent to 3 modulo 4, then: is solvable if and only if is not solvable. The last is immediately equivalent to the modern form stated in the introduction above.

  3. Modular arithmetic - Wikipedia

    en.wikipedia.org/wiki/Modular_arithmetic

    Adding 4 hours to 9 o'clock gives 1 o'clock, since 13 is congruent to 1 modulo 12. In mathematics, modular arithmetic is a system of arithmetic for integers, where numbers "wrap around" when reaching a certain value, called the modulus. The modern approach to modular arithmetic was developed by Carl Friedrich Gauss in his book Disquisitiones ...

  4. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For instance, the first counterexample must be odd because f(2n) = n, smaller than 2n; and it must be 3 mod 4 because f 2 (4n + 1) = 3n + 1, smaller than 4n + 1. For each starting value a which is not a counterexample to the Collatz conjecture, there is a k for which such an inequality holds, so checking the Collatz conjecture for one starting ...

  5. Covering system - Wikipedia

    en.wikipedia.org/wiki/Covering_system

    Hough and Nielsen (2019) [1] proved that any distinct covering system has a modulus that is divisible by either 2 or 3. A covering system is called irredundant (or minimal) if all the residue classes are required to cover the integers. The first two examples are disjoint. The third example is distinct. A system (i.e., an unordered multi-set)

  6. Supersingular elliptic curve - Wikipedia

    en.wikipedia.org/wiki/Supersingular_elliptic_curve

    There are exactly ⌊p/12⌋ supersingular elliptic curves with automorphism groups of order 2. In addition if p≡3 mod 4 there is a supersingular elliptic curve (with j-invariant 1728) whose automorphism group is cyclic or order 4 unless p=3 in which case it has order 12, and if p≡2 mod 3 there is a supersingular elliptic curve (with j ...

  7. Next Generation Science Standards - Wikipedia

    en.wikipedia.org/wiki/Next_Generation_Science...

    The Next Generation Science Standards (NGSS) are based on the "Framework K–12 Science Education" that was created by the National Research Council. They have three dimensions that are integrated in instruction at all levels. The first dimension is the Disciplinary Core Ideas (the DCIs), which consists of content and concepts specific to four ...

  8. Scientific method - Wikipedia

    en.wikipedia.org/wiki/Scientific_method

    e. The scientific method is an empirical method for acquiring knowledge that has characterized the development of science since at least the 17th century. The scientific method involves careful observation coupled with rigorous scepticism, because cognitive assumptions can distort the interpretation of the observation.

  9. Three-body problem - Wikipedia

    en.wikipedia.org/wiki/Three-body_problem

    "Three body problem". Scholarpedia. 2 (10): 2111. Bibcode:2007SchpJ...2.2111C. doi: 10.4249/scholarpedia.2111. Physicists Discover a Whopping 13 New Solutions to Three-Body Problem (Science) 3body simulator Archived 2022-11-17 at the Wayback Machine – an example of a computer program that solves the three-body problem numerically

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