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  2. Stern–Brocot tree - Wikipedia

    en.wikipedia.org/wiki/Stern–Brocot_tree

    For instance, the continued fraction representation of ⁠ 13 / 9 ⁠ is [1;2,4] and its two children are [1;2,5] = ⁠ 16 / 11 ⁠ (the right child) and [1;2,3,2] = ⁠ 23 / 16 ⁠ (the left child). It is clear that for each finite continued fraction expression one can repeatedly move to its parent, and reach the root [1;] = ⁠ 1 / 1 ⁠ of ...

  3. 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.

  4. Ordinal numeral - Wikipedia

    en.wikipedia.org/wiki/Ordinal_numeral

    Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced.

  5. Calkin–Wilf tree - Wikipedia

    en.wikipedia.org/wiki/Calkin–Wilf_tree

    In number theory, the Calkin–Wilf tree is a tree in which the vertices correspond one-to-one to the positive rational numbers.The tree is rooted at the number 1, and any rational number q expressed in simplest terms as the fraction ⁠ a / b ⁠ has as its two children the numbers ⁠ 1 / 1+1/q ⁠ = ⁠ a / a + b ⁠ and q + 1 = ⁠ a + b / b ⁠.

  6. List of fractals by Hausdorff dimension - Wikipedia

    en.wikipedia.org/wiki/List_of_fractals_by...

    Can be built with two dragon curves. One of the six 2-rep-tiles in the plane (can be tiled by two copies of itself, of equal size). [13] ⁡ 1.5850: 3-branches tree: Each branch carries 3 branches (here 90° and 60°). The fractal dimension of the entire tree is the fractal dimension of the terminal branches.

  7. Tree of primitive Pythagorean triples - Wikipedia

    en.wikipedia.org/wiki/Tree_of_primitive...

    (Alternatively, write t = n / m as a fraction in lowest terms and use the formulas from the previous section.) A root node that instead has value t = 1/3 will give the same tree of primitive Pythagorean triples, though with the values of a and b switched.

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