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  2. List of unsolved problems in mathematics - Wikipedia

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

    Tutte's conjectures: every bridgeless graph has a nowhere-zero 5-flow [ 135] every Petersen - minor -free bridgeless graph has a nowhere-zero 4-flow [ 136] Woodall's conjecture that the minimum number of edges in a dicut of a directed graph is equal to the maximum number of disjoint dijoins.

  3. Hadwiger–Nelson problem - Wikipedia

    en.wikipedia.org/wiki/Hadwiger–Nelson_problem

    The Hadwiger–Nelson problem is to find the chromatic number of G. As a consequence, the problem is often called "finding the chromatic number of the plane". By the de Bruijn–Erdős theorem, a result of de Bruijn & Erdős (1951), the problem is equivalent (under the assumption of the axiom of choice) to that of finding the largest possible ...

  4. Nonstandard analysis - Wikipedia

    en.wikipedia.org/wiki/Nonstandard_analysis

    Nelson introduced an entirely axiomatic formulation of nonstandard analysis that he called internal set theory (IST). [13] IST is an extension of Zermelo–Fraenkel set theory (ZF) in that alongside the basic binary membership relation ∈, it introduces a new unary predicate standard , which can be applied to elements of the mathematical ...

  5. Edward Nelson - Wikipedia

    en.wikipedia.org/wiki/Edward_Nelson

    Greg Lawler. Edward Nelson (May 4, 1932 – September 10, 2014) was an American mathematician. He was professor in the Mathematics Department at Princeton University. He was known for his work on mathematical physics and mathematical logic. In mathematical logic, he was noted especially for his internal set theory, and views on ultrafinitism ...

  6. Internal set theory - Wikipedia

    en.wikipedia.org/wiki/Internal_set_theory

    Internal set theory. Internal set theory ( IST) is a mathematical theory of sets developed by Edward Nelson that provides an axiomatic basis for a portion of the nonstandard analysis introduced by Abraham Robinson. Instead of adding new elements to the real numbers, Nelson's approach modifies the axiomatic foundations through syntactic enrichment.

  7. List of Melbourne Storm records - Wikipedia

    en.wikipedia.org/wiki/List_of_Melbourne_Storm...

    Dangerous throw (Grade 4) 9 matches (965 demerit points) 2000: Round 15: Stephen Kearney: Dangerous throw (Grade 3) 8 matches (884 demerit points) 2006: Round 4: Billy Slater: Kicking (Grade 5) 7 matches (788 demerit points) 2014: Round 3: Jordan McLean: Dangerous throw (Grade 2) 7 matches (700 demerit points) 2001: Round 1: Rodney Howe ...

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