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  2. Class (set theory) - Wikipedia

    en.wikipedia.org/wiki/Class_(set_theory)

    A class that is not a set (informally in Zermelo–Fraenkel) is called a proper class, and a class that is a set is sometimes called a small class. For instance, the class of all ordinal numbers , and the class of all sets, are proper classes in many formal systems.

  3. Ideal class group - Wikipedia

    en.wikipedia.org/wiki/Ideal_class_group

    In mathematics, the ideal class group (or class group) of an algebraic number field K is the quotient group J K /P K where J K is the group of fractional ideals of the ring of integers of K, and P K is its subgroup of principal ideals. The class group is a measure of the extent to which unique factorization fails in the ring of integers of K.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and ...

  5. Equivalence class - Wikipedia

    en.wikipedia.org/wiki/Equivalence_class

    The word "class" in the term "equivalence class" may generally be considered as a synonym of "set", although some equivalence classes are not sets but proper classes. For example, "being isomorphic " is an equivalence relation on groups , and the equivalence classes, called isomorphism classes , are not sets.

  6. ‘Heartbreaking’ test score shows US children falling behind ...

    www.aol.com/news/heartbreaking-test-score-shows...

    And in fourth-grade math, scores are down 3 points. “The Trump Administration is committed to reorienting our education system to fully empower states, to prioritize meaningful learning, and ...

  7. Wisconsin 4th grade reading scores drop, 8th grade math 3rd ...

    www.aol.com/news/wisconsin-4th-grade-reading...

    (The Center Square) – Wisconsin’s fourth-grade test scores showed a continued decrease in aptitude while the eighth-grade math scores were the third-highest in the country in results of the ...