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  2. Septimal minor third - Wikipedia

    en.wikipedia.org/wiki/Septimal_minor_third

    Septimal minor third on C Origin of large and small seconds and thirds in harmonic series. [2]In music, the septimal minor third, also called the subminor third (e.g., by Ellis [3] [4]) or septimal subminor third, is the musical interval exactly or approximately equal to a 7/6 ratio of frequencies. [5]

  3. List of pitch intervals - Wikipedia

    en.wikipedia.org/wiki/List_of_pitch_intervals

    Comparison between tunings: Pythagorean, equal-tempered, quarter-comma meantone, and others.For each, the common origin is arbitrarily chosen as C. The degrees are arranged in the order or the cycle of fifths; as in each of these tunings except just intonation all fifths are of the same size, the tunings appear as straight lines, the slope indicating the relative tempering with respect to ...

  4. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    6 are red, and; 4 are yellow, then the ratio of red to white to yellow cars is 6 to 2 to 4. The ratio of yellow cars to white cars is 4 to 2 and may be expressed as 4:2 or 2:1. A ratio is often converted to a fraction when it is expressed as a ratio to the whole. In the above example, the ratio of yellow cars to all the cars on the lot is 4:12 ...

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Often replaced by a horizontal bar. For example, 3 / 2 or . 2. Denotes a quotient structure. For example, quotient set, quotient group, quotient category, etc. 3. In number theory and field theory, / denotes a field extension, where F is an extension field of the field E. 4.

  7. Numbered musical notation - Wikipedia

    en.wikipedia.org/wiki/Numbered_musical_notation

    4 time is usually implied). Sometimes a piece is written with multiple time signatures simultaneously. For example, it might specify 4/4 2/4 3/4 5/4, meaning that the length of measures is irregular and can be 4, 2, 3 or 5 quarter-notes. The time signature of the first measure is always specified first, and the others are placed in increasing ...

  8. Alla breve - Wikipedia

    en.wikipedia.org/wiki/Alla_breve

    Examples of time signatures for alla breve Examples of time signatures for common time. Alla breve [alla ˈbrɛːve] – also known as cut time or cut common time – is a musical meter notated by the time signature symbol (a C) with a vertical line through it, which is the equivalent of 2

  9. Farey sequence - Wikipedia

    en.wikipedia.org/wiki/Farey_sequence

    In mathematics, the Farey sequence of order n is the sequence of completely reduced fractions, either between 0 and 1, or without this restriction, [a] which when in lowest terms have denominators less than or equal to n, arranged in order of increasing size.