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  2. List of number fields with class number one - Wikipedia

    en.wikipedia.org/wiki/List_of_number_fields_with...

    The class number of a number field is by definition the order of the ideal class group of its ring of integers. Thus, a number field has class number 1 if and only if its ring of integers is a principal ideal domain (and thus a unique factorization domain). The fundamental theorem of arithmetic says that Q has class number 1.

  3. Google Classroom - Wikipedia

    en.wikipedia.org/wiki/Google_Classroom

    As of 2021, approximately 150 million users use Google Classroom. [5] Google Classroom uses a variety of proprietary user applications (Google Applications for Education) with the goal of managing student and teacher communication. Students can be invited to join a class through a private code or be imported automatically from a school domain.

  4. History of Google - Wikipedia

    en.wikipedia.org/wiki/History_of_Google

    Scott Hassan and Alan Steremberg were cited by Page and Brin as being critical to the development of Google. Rajeev Motwani and Terry Winograd later co-authored with Page and Brin the first paper about the project, describing PageRank and the initial prototype of the Google search engine, published in 1998. Héctor García-Molina and Jeff Ullman were also cited as contributors to the project ...

  5. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  6. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  7. Mathematics Subject Classification - Wikipedia

    en.wikipedia.org/wiki/Mathematics_Subject...

    For example, for differential geometry, the top-level code is 53, and the second-level codes are: A for classical differential geometry; B for local differential geometry; C for global differential geometry; D for symplectic geometry and contact geometry; In addition, the special second-level code "-" is used for specific kinds of materials.

  8. Codecademy - Wikipedia

    en.wikipedia.org/wiki/Codecademy

    Code Year was a free incentive Codecademy program intended to help people follow through on a New Year's Resolution to learn how to program, by introducing a new course for every week in 2012. [32] Over 450,000 people took courses in 2012, [ 33 ] [ 34 ] and Codecademy continued the program into 2013.

  9. Library of Congress Classification:Class T -- Technology

    en.wikipedia.org/wiki/Library_of_Congress...

    Class T: Technology is a classification used by the Library of Congress Classification system. This page outlines the subclasses of Class T. [ 1 ] [ 2 ] T - Technology (general)