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  2. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. ... In practice, bulk materials such as sugar, sand, or snow contain ...

  3. Buffon's needle problem - Wikipedia

    en.wikipedia.org/wiki/Buffon's_needle_problem

    In probability theory, Buffon's needle problem is a question first posed in the 18th century by Georges-Louis Leclerc, Comte de Buffon: [1] Suppose we have a floor made of parallel strips of wood , each the same width, and we drop a needle onto the floor.

  4. Dense subgraph - Wikipedia

    en.wikipedia.org/wiki/Dense_subgraph

    Though 50% is a tight bound, in practice, this greedy peeling procedure yields about 80% of the optimal density on real-world graphs. [ 3 ] In 2020, Boob et al. gave an iterative peeling algorithm that aims to get closer to the optimal subgraph by repeated the peeling procedure multiple times. [ 3 ]

  5. Histogram - Wikipedia

    en.wikipedia.org/wiki/Histogram

    The correlated variation of a kernel density estimate is very difficult to describe mathematically, while it is simple for a histogram where each bin varies independently. An alternative to kernel density estimation is the average shifted histogram, [8] which is fast to compute and gives a smooth curve estimate of the density without using kernels.

  6. Density theorem - Wikipedia

    en.wikipedia.org/wiki/Density_theorem

    Density theorem (category theory) in category theory This page was last edited on 6 August 2017, at 11:03 (UTC). Text is available under the Creative Commons ...

  7. Packing problems - Wikipedia

    en.wikipedia.org/wiki/Packing_problems

    The hexagonal packing of circles on a 2-dimensional Euclidean plane. These problems are mathematically distinct from the ideas in the circle packing theorem.The related circle packing problem deals with packing circles, possibly of different sizes, on a surface, for instance the plane or a sphere.