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  2. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  3. List of common coordinate transformations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_coordinate...

    Note: solving for ′ returns the resultant angle in the first quadrant (< <). To find , one must refer to the original Cartesian coordinate, determine the quadrant in which lies (for example, (3,−3) [Cartesian] lies in QIV), then use the following to solve for :

  4. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where C is the circumference of a circle, d is the diameter, and r is the radius.More generally, = where L and w are, respectively, the perimeter and the width of any curve of constant width.

  5. List of Mersenne primes and perfect numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_Mersenne_primes...

    For example, 3 is a Mersenne prime as it is a prime number and is expressible as 2 2 − 1. [1] [2] The exponents p corresponding to Mersenne primes must themselves be prime, although the vast majority of primes p do not lead to Mersenne primes—for example, 2 11 − 1 = 2047 = 23 × 89. [3]

  6. Cartesian tree - Wikipedia

    en.wikipedia.org/wiki/Cartesian_tree

    Cartesian trees are defined using binary trees, which are a form of rooted tree.To construct the Cartesian tree for a given sequence of distinct numbers, set its root to be the minimum number in the sequence, [1] and recursively construct its left and right subtrees from the subsequences before and after this number, respectively.

  7. 1/12 - Wikipedia

    en.wikipedia.org/wiki/1/12

    1/12 may refer to: January 12 (month-day date notation) December 1 (day-month date notation) January 12 AD (month-year date notation) 1 AD December (year-month date notation) 1st Battalion, 12th Marines, an artillery battalion of the United States Marine Corps; 1/12 or 1:12 scale; Maximum slope of a wheelchair ramp under regulations in several ...

  8. Cylindrical coordinate system - Wikipedia

    en.wikipedia.org/wiki/Cylindrical_coordinate_system

    The three surfaces intersect at the point P with those coordinates (shown as a black sphere); the Cartesian coordinates of P are roughly (1.0, −1.732, 1.0). Cylindrical coordinate surfaces. The three orthogonal components, ρ (green), φ (red), and z (blue), each increasing at a constant rate. The point is at the intersection between the ...

  9. Twelfth root of two - Wikipedia

    en.wikipedia.org/wiki/Twelfth_root_of_two

    One octave of 12-tet on a monochord (linear) The chromatic circle depicts equal distances between notes (logarithmic) Since the frequency ratio of a semitone is close to 106% ( 100 2 12 ≈ 105.946 {\textstyle 100{\sqrt[{12}]{2}}\approx 105.946} ), increasing or decreasing the playback speed of a recording by 6% will shift the pitch up or down ...