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  2. Linear scale - Wikipedia

    en.wikipedia.org/wiki/Linear_scale

    The drawing was made 130 years after the bridge was built. A linear scale, also called a bar scale, scale bar, graphic scale, or graphical scale, is a means of visually showing the scale of a map, nautical chart, engineering drawing, or architectural drawing. A scale bar is common element of map layouts.

  3. Oblique projection - Wikipedia

    en.wikipedia.org/wiki/Oblique_projection

    The foreshortening factor (1/2 in this example) is inversely proportional to the tangent of the angle (63.43° in this example) between the projection plane (colored brown) and the projection lines (dotted). Front view of the same. Oblique projection is a type of parallel projection: it projects an image by intersecting parallel rays (projectors)

  4. Indian units of measurement - Wikipedia

    en.wikipedia.org/wiki/Indian_units_of_measurement

    Before the introduction of the metric system, one may divide the history of Indian systems of measurement into three main periods: the pre-Akbar period, the period of the Akbar system, and the British colonial period.

  5. Singapore math - Wikipedia

    en.wikipedia.org/wiki/Singapore_math

    Compared to a traditional U.S. math curriculum, Singapore math focuses on fewer topics but covers them in greater detail. [3] Each semester-level Singapore math textbook builds upon prior knowledge and skills, with students mastering them before moving on to the next grade.

  6. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    Problems 1, 2, 5, 6, [a] 9, 11, 12, 15, and 22 have solutions that have partial acceptance, but there exists some controversy as to whether they resolve the problems. That leaves 8 (the Riemann hypothesis), 13 and 16 [b] unresolved. Problems 4 and 23 are considered as too vague to ever be described as solved; the withdrawn 24 would also be in ...

  7. Crossing number (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Crossing_number_(graph_theory)

    A drawing of the Heawood graph with three crossings. This is the minimum number of crossings among all drawings of this graph, so the graph has crossing number cr(G) = 3.. In graph theory, the crossing number cr(G) of a graph G is the lowest number of edge crossings of a plane drawing of the graph G.

  8. List of mathematical artists - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_artists

    This is a list of artists who actively explored mathematics in their artworks. [3] Art forms practised by these artists include painting, sculpture, architecture, textiles and origami. Some artists such as Piero della Francesca and Luca Pacioli went so far as to write books on mathematics in art.

  9. National Physical Laboratory of India - Wikipedia

    en.wikipedia.org/wiki/National_Physical...

    However, in 1963 on the recommendation of Nobel Laureate P.M.S. Blackett, these groups were brought together under a single umbrella. The objective was to bring greater coordination between the various groups and to give the standards activity a programme-based approach on a bigger scale and enable the Laboratory to play its role more effectively.