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  2. Diminished triad - Wikipedia

    en.wikipedia.org/wiki/Diminished_triad

    In 5-limit just intonation, the diminished chord on VII (in C: B–D–F) is 15:8, 9:8, and 4:3, while on II (in C: D–F–A ♭) it is 9:8, 4:3, and 8:5 (135:160:192). According to Georg Andreas Sorge , the trumpet , in its overtone series on C, gives the diminished triad E–G–B ♭ = 5:6:7 ("perfect diminished chord" [ 11 ] ), but the 7 ...

  3. 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]

  4. DE-9IM - Wikipedia

    en.wikipedia.org/wiki/DE-9IM

    The Dimensionally Extended 9-Intersection Model (DE-9IM) is a topological model and a standard used to describe the spatial relations of two regions (two geometries in two-dimensions, R 2), in geometry, point-set topology, geospatial topology, and fields related to computer spatial analysis.

  5. List of stars that have unusual dimming periods - Wikipedia

    en.wikipedia.org/wiki/List_of_stars_that_have...

    Artist's concept of an "uneven ring of dust" orbiting KIC 8462852, also known as Tabby's Star. This list of stars that have unusual dimming periods is a table of stars that have been observed to darken and brighten and do not appear to be eclipsing binaries or intrinsic variables.

  6. Diminished third - Wikipedia

    en.wikipedia.org/wiki/Diminished_third

    [1] [4] For instance, the interval from A to C is a minor third, three semitones wide, and both the intervals from A ♯ to C, and from A to C ♭ are diminished thirds, two semitones wide. Being diminished, it is considered a dissonant interval. [5]

  7. 248 (number) - Wikipedia

    en.wikipedia.org/wiki/248_(number)

    248 (two hundred [and] forty-eight) is the natural number following 247 and preceding 249 ... a Harshad number in bases 3, 4, 6, 7, 9, 11, 13 (and 18 other bases).

  8. Compact stencil - Wikipedia

    en.wikipedia.org/wiki/Compact_stencil

    For any structured grid utilizing a compact stencil in 1, 2, or 3 dimensions the maximum number of nodes is 3, 9, or 27 respectively. Compact stencils may be compared to non-compact stencils . Compact stencils are currently implemented in many partial differential equation solvers, including several in the topics of CFD, FEA, and other ...

  9. Stirling numbers of the second kind - Wikipedia

    en.wikipedia.org/wiki/Stirling_numbers_of_the...

    For instance, the number 25 in column k = 3 and row n = 5 is given by 25 = 7 + (3×6), where 7 is the number above and to the left of 25, 6 is the number above 25 and 3 is the column containing the 6.