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  2. Musical temperament - Wikipedia

    en.wikipedia.org/wiki/Musical_temperament

    Their solution, laid out by Pietro Aron in the early 16th century, was a series of tunings referred to as meantone temperaments, which temper the interval of a perfect fifth slightly flatter than in just intonation, and then proceed much like Pythagorean tuning, but using tempered fifths instead of the just fifths. With the correct amount of ...

  3. Equal temperament - Wikipedia

    en.wikipedia.org/wiki/Equal_temperament

    12 tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. An equal temperament is a musical temperament or tuning system that approximates just intervals by dividing an octave (or other interval) into steps such that the ratio of the frequencies of any adjacent pair of notes is the same.

  4. Meantone temperament - Wikipedia

    en.wikipedia.org/wiki/Meantone_temperament

    For 12 tone equally-tempered tuning, the fifths have to be tempered by considerably less than a ⁠ 1 / 4 ⁠ comma (very close to a ⁠ 1 / 11 ⁠ syntonic comma, or a ⁠ 1 / 12 ⁠ Pythagorean comma), since they must form a perfect cycle, with no gap at the end, whereas ⁠ 1 / 4 ⁠ comma meantone tuning, as mentioned above, has a residual ...

  5. 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.

  6. 12 equal temperament - Wikipedia

    en.wikipedia.org/wiki/12_equal_temperament

    12-tone equal temperament chromatic scale on C, one full octave ascending, notated only with sharps. Play ascending and descending ⓘ. 12 equal temperament (12-ET) [a] is the musical system that divides the octave into 12 parts, all of which are equally tempered (equally spaced) on a logarithmic scale, with a ratio equal to the 12th root of 2 (≈ 1.05946).

  7. Wolf interval - Wikipedia

    en.wikipedia.org/wiki/Wolf_interval

    The only problem is at the edge, on the note E ♯. The note that is a tempered perfect fifth higher than E ♯ is B ♯, which is not included on the keyboard shown (although it could be included in a larger keyboard, placed just to the right of A ♯, hence maintaining the keyboard's consistent

  8. Problem Solving Through Recreational Mathematics - Wikipedia

    en.wikipedia.org/wiki/Problem_Solving_Through...

    Problem Solving Through Recreational Mathematics is based on mathematics courses taught by the authors, who were both mathematics professors at Temple University. [1] [2] It follows a principle in mathematics education popularized by George Pólya, of focusing on techniques for mathematical problem solving, motivated by the idea that by doing mathematics rather than being told about its ...

  9. Tempered representation - Wikipedia

    en.wikipedia.org/wiki/Tempered_representation

    Any irreducible tempered representation is a basic representation, and conversely any basic representation is the sum of a finite number of irreducible tempered representations. More precisely, it is a direct sum of 2 r irreducible tempered representations indexed by the characters of an elementary abelian group R of order 2 r (called the R ...