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2. Golden ratio - Wikipedia

   en.wikipedia.org/wiki/Golden_ratio

   The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial. This quadratic polynomial has two roots, and. The golden ratio is also closely related to the polynomial. which has roots and As the root of a quadratic polynomial, the golden ratio is a constructible number.

3. Geometric progression - Wikipedia

   en.wikipedia.org/wiki/Geometric_progression

   The first block is a unit block and the dashed line represents the infinite sum of the sequence, a number that it will forever approach but never touch: 2, 3/2, and 4/3 respectively. A geometric progression, also known as a geometric sequence, is a mathematical sequence of non-zero numbers where each term after the first is found by multiplying ...

4. CIE 1931 color space - Wikipedia

   en.wikipedia.org/wiki/CIE_1931_color_space

   A comparison between a typical normalized M cone's spectral sensitivity and the CIE 1931 luminosity function for a standard observer in photopic vision.. In the CIE 1931 model, Y is the luminance, Z is quasi-equal to blue (of CIE RGB), and X is a mix of the three CIE RGB curves chosen to be nonnegative (see § Definition of the CIE XYZ color space).

5. Punnett square - Wikipedia

   en.wikipedia.org/wiki/Punnett_square

   The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. It is named after Reginald C. Punnett, who devised the approach in 1905. [3][4][5][6][7][8] The diagram is used by biologists to determine the probability of an offspring having a particular genotype.

6. Geometric series - Wikipedia

   en.wikipedia.org/wiki/Geometric_series

   A geometric series is a unit series, meaning the series sum converges to one, if and only if and . The terms of a geometric series are also the elements of a generalized Fibonacci sequence (a recursively defined sequence with when the series's common ratio satisfies the constraint , which is when equals the golden ratio or its conjugate .

7. Choropleth map - Wikipedia

   en.wikipedia.org/wiki/Choropleth_map

   Choropleth map. A choropleth map that visualizes the fraction of Australians that identified as Anglican at the 2011 census. The selected districts are local government areas, the variable is spatially intensive (a proportion) which is unclassed, and a part-spectral sequential color scheme is used. A choropleth map (from Ancient Greek ...

8. Silver ratio - Wikipedia

   en.wikipedia.org/wiki/Silver_ratio

   The silver ratio is a Pisot–Vijayaraghavan number (PV number), as its conjugate 1 − √ 2 = ⁠ −1 δS⁠ ≈ −0.41421 has absolute value less than 1. In fact it is the second smallest quadratic PV number after the golden ratio. This means the distance from δ n. S to the nearest integer is ⁠ 1 δ n.

9. Proportion (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Proportion_(mathematics)

   Proportion (mathematics) A proportion is a mathematical statement expressing equality of two ratios. [1][2] a and d are called extremes, b and c are called means. Proportion can be written as , where ratios are expressed as fractions. Such a proportion is known as geometrical proportion, [3] not to be confused with arithmetical proportion and ...