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  2. Illumination problem - Wikipedia

    en.wikipedia.org/wiki/Illumination_problem

    Roger Penrose's solution of the illumination problem using elliptical arcs (blue) and straight line segments (green), with 3 positions of the single light source (red spot). The purple crosses are the foci of the larger arcs. Lit and unlit regions are shown in yellow and grey respectively.

  3. Five-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Five-dimensional_space

    An important uniform 5-polytope is the 5-demicube, h{4,3,3,3} has half the vertices of the 5-cube (16), bounded by alternating 5-cell and 16-cell hypercells. The expanded or stericated 5-simplex is the vertex figure of the A 5 lattice, . It and has a doubled symmetry from its symmetric Coxeter diagram.

  4. Dimension (vector space) - Wikipedia

    en.wikipedia.org/wiki/Dimension_(vector_space)

    A diagram of dimensions 1, 2, 3, and 4. In mathematics, the dimension of a vector space V is the cardinality (i.e., the number of vectors) of a basis of V over its base field. [1] [2] It is sometimes called Hamel dimension (after Georg Hamel) or algebraic dimension to distinguish it from other types of dimension.

  5. Photoelectric effect - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_effect

    In 1905, Albert Einstein published a paper advancing the hypothesis that light energy is carried in discrete quantized packets to explain experimental data from the photoelectric effect. Einstein theorized that the energy in each quantum of light was equal to the frequency of light multiplied by a constant, later called the Planck constant. A ...

  6. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  7. Dimension - Wikipedia

    en.wikipedia.org/wiki/Dimension

    Moreover, X has dimension −1, i.e. dim X = −1 if and only if X is empty. This definition of covering dimension can be extended from the class of normal spaces to all Tychonoff spaces merely by replacing the term "open" in the definition by the term "functionally open". An inductive dimension may be defined inductively as follows.

  8. What is gaslighting? 9 common examples and how to ... - AOL

    www.aol.com/news/gaslighting-9-common-examples...

    Examples of trivializing: You ask to be paid for the extra hours you have put in at work, and your boss asks you if you think you are better than everyone else. After insulting you, your partner ...

  9. Rope-burning puzzle - Wikipedia

    en.wikipedia.org/wiki/Rope-burning_puzzle

    For instance, by the solution to the example problem, is a fusible number. [ 7 ] One may assume without loss of generality that every fuse is lit at both ends, by replacing a fuse that is lit only at one end at time x {\displaystyle x} by two fuses, the first one lit at both ends at time x {\displaystyle x} and the second one lit at both ends ...