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  2. Lists of school districts in the United States - Wikipedia

    en.wikipedia.org/wiki/Lists_of_school_districts...

    American Samoa: American Samoa Department of Education. Guam: Guam Department of Education. Northern Mariana Islands: Commonwealth of the Northern Mariana Islands Public School System. Puerto Rico: Puerto Rico Department of Education. List of school districts in the United States Virgin Islands.

  3. List of unsolved problems in mathematics - Wikipedia

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

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  4. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    As an illustration of this, the parity cycle (1 1 0 0 1 1 0 0) and its sub-cycle (1 1 0 0) are associated to the same fraction ⁠ 5 / 7 ⁠ when reduced to lowest terms. In this context, assuming the validity of the Collatz conjecture implies that (1 0) and (0 1) are the only parity cycles generated by positive whole numbers (1 and 2 ...

  5. Travelling salesman problem - Wikipedia

    en.wikipedia.org/wiki/Travelling_salesman_problem

    Another related problem is the bottleneck travelling salesman problem: Find a Hamiltonian cycle in a weighted graph with the minimal weight of the weightiest edge. A real-world example is avoiding narrow streets with big buses. [15] The problem is of considerable practical importance, apart from evident transportation and logistics areas.

  6. How to Solve It - Wikipedia

    en.wikipedia.org/wiki/How_to_Solve_It

    First, you have to understand the problem. [2] After understanding, make a plan. [3] Carry out the plan. [4] Look back on your work. [5] How could it be better? If this technique fails, Pólya advises: [6] "If you cannot solve the proposed problem, try to solve first some related problem. Could you imagine a more accessible related problem?"

  7. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    e. The Millennium Prize Problems are seven well-known complex mathematical problems selected by the Clay Mathematics Institute in 2000. The Clay Institute has pledged a US$ 1 million prize for the first correct solution to each problem. The Clay Mathematics Institute officially designated the title Millennium Problem for the seven unsolved ...

  8. List of ICD-9 codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ICD-9_codes

    The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. [1] [2] List of ICD-9 codes 001–139: infectious and parasitic diseases; List of ICD-9 codes 140–239: neoplasms; List of ICD-9 codes 240–279: endocrine, nutritional and metabolic diseases, and immunity disorders

  9. Lists of schools in the United States - Wikipedia

    en.wikipedia.org/wiki/Lists_of_schools_in_the...

    California: school districts by county: school districts · high schools. Colorado by county: school districts · high schools. Connecticut: school districts · high schools. Delaware by county: school districts · high schools. District of Columbia: public schools · high schools. Florida: school districts · high schools.