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  2. iCivics - Wikipedia

    en.wikipedia.org/wiki/ICivics

    iCivics, Inc. (formerly Our Courts) is a 501(c)(3) non-profit organization in the United States that provides educational online games and lesson plans to promote civics education and encourage students to become active citizens.

  3. Big Ideas Learning - Wikipedia

    en.wikipedia.org/wiki/Big_Ideas_Learning

    The first publication for Big Ideas Learning was a series of middle school mathematics textbooks that implemented the NCTM's focal point curriculum. Each book had a national edition and a Florida edition, which was submitted for adoption in the state of Florida. [ 5 ]

  4. Cheat sheet - Wikipedia

    en.wikipedia.org/wiki/Cheat_sheet

    A cheat sheet that is used contrary to the rules of an exam may need to be small enough to conceal in the palm of the hand Cheat sheet in front of a juice box. A cheat sheet (also cheatsheet) or crib sheet is a concise set of notes used for quick reference.

  5. Michael Rosen (mathematician) - Wikipedia

    en.wikipedia.org/wiki/Michael_Rosen_(mathematician)

    He is a mathematics professor at Brown University. Rosen is known for his textbooks, especially for the book with co-author Kenneth Ireland on number theory, which was inspired by ideas of André Weil ; [ 1 ] this book, A Classical Introduction to Modern Number Theory , gives an introduction to zeta functions of algebraic curves , the Weil ...

  6. Euclid's Elements - Wikipedia

    en.wikipedia.org/wiki/Euclid's_Elements

    The Elements (Ancient Greek: Στοιχεῖα Stoikheîa) is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid c. 300 BC. It is a collection of definitions, postulates, propositions (theorems and constructions), and mathematical proofs of the propositions.

  7. Circle of fifths - Wikipedia

    en.wikipedia.org/wiki/Circle_of_fifths

    The standard tempered fifth has a frequency ratio of 2 7/12:1 (or about 1.498307077:1), approximately two cents narrower than a justly tuned fifth. Ascending by twelve justly tuned fifths fails to close the circle by an excess of approximately 23.46 cents , roughly a quarter of a semitone , an interval known as the Pythagorean comma .

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