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  2. Longest common substring - Wikipedia

    en.wikipedia.org/wiki/Longest_common_substring

    The variable z is used to hold the length of the longest common substring found so far. The set ret is used to hold the set of strings which are of length z . The set ret can be saved efficiently by just storing the index i , which is the last character of the longest common substring (of size z) instead of S[(i-z+1)..i] .

  3. Polar (star) - Wikipedia

    en.wikipedia.org/wiki/Polar_(star)

    Polar variables are magnetic white dwarfs accreting material from a low mass donor, with no accretion disk due to the intense magnetic field. In astronomy, a polar is a highly magnetic type of cataclysmic variable (CV) binary star system, originally known as an AM Herculis star after the prototype member AM Herculis.

  4. Cataclysmic variable star - Wikipedia

    en.wikipedia.org/wiki/Cataclysmic_variable_star

    In astronomy, cataclysmic variable stars (CVs) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state. They were initially called novae (from Latin 'new'), since ones with an outburst brightness visible to the naked eye and an invisible quiescent brightness appeared as new stars in the sky.

  5. Polar curve - Wikipedia

    en.wikipedia.org/wiki/Polar_curve

    To see this, pick two points P and Q on L. The locus of points whose polar lines pass through P is the first polar of P and this is a curve of degree n−1. Similarly, the locus of points whose polar lines pass through Q is the first polar of Q and this is also a curve of degree n−1.

  6. Duality (projective geometry) - Wikipedia

    en.wikipedia.org/wiki/Duality_(projective_geometry)

    Polars of diagonal points are colored the same as the points. The theory of poles and polars of a conic in a projective plane can be developed without the use of coordinates and other metric concepts. Let C be a conic in PG(2, F) where F is a field not of characteristic two, and let P be a point of this plane not on C.

  7. Biharmonic equation - Wikipedia

    en.wikipedia.org/wiki/Biharmonic_equation

    In two-dimensional polar coordinates, the biharmonic equation is ((())) + + + = which can be solved by separation of variables. The result is the Michell solution . 2-dimensional space

  8. Pole and polar - Wikipedia

    en.wikipedia.org/wiki/Pole_and_polar

    More generally, the polars of all the points on the line q must pass through its pole Q. The relationship between poles and polars is reciprocal. Thus, if a point A lies on the polar line q of a point Q, then the point Q must lie on the polar line a of the point A. The two polar lines a and q need not be parallel.

  9. Levenshtein distance - Wikipedia

    en.wikipedia.org/wiki/Levenshtein_distance

    In information theory, linguistics, and computer science, the Levenshtein distance is a string metric for measuring the difference between two sequences. The Levenshtein distance between two words is the minimum number of single-character edits (insertions, deletions or substitutions) required to change one word into the other.