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  2. Alhazen's problem - Wikipedia

    en.wikipedia.org/wiki/Alhazen's_problem

    Alhazen's problem, also known as Alhazen's billiard problem, is a mathematical problem in geometrical optics first formulated by Ptolemy in 150 AD. [1] It is named for the 11th-century Arab mathematician Alhazen ( Ibn al-Haytham ) who presented a geometric solution in his Book of Optics .

  3. Abu Kamil - Wikipedia

    en.wikipedia.org/wiki/Abu_Kamil

    The first chapter teaches algebra by solving problems of application to geometry, often involving an unknown variable and square roots. The second chapter deals with the six types of problems found in Al-Khwarizmi's book, [ 9 ] but some of which, especially those of x 2 {\displaystyle x^{2}} , were now worked out directly instead of first ...

  4. Galois theory - Wikipedia

    en.wikipedia.org/wiki/Galois_theory

    Galois theory has been used to solve classic problems including showing that two problems of antiquity cannot be solved as they were stated (doubling the cube and trisecting the angle), and characterizing the regular polygons that are constructible (this characterization was previously given by Gauss but without the proof that the list of ...

  5. Rectangular potential barrier - Wikipedia

    en.wikipedia.org/wiki/Rectangular_potential_barrier

    In quantum mechanics, the rectangular (or, at times, square) potential barrier is a standard one-dimensional problem that demonstrates the phenomena of wave-mechanical tunneling (also called "quantum tunneling") and wave-mechanical reflection. The problem consists of solving the one-dimensional time-independent Schrödinger equation for a ...

  6. Algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Algebraic_geometry

    Algebraic geometry is a branch of mathematics which uses abstract algebraic techniques, mainly from commutative algebra, to solve geometrical problems. Classically, it studies zeros of multivariate polynomials; the modern approach generalizes this in a few different aspects.

  7. Householder transformation - Wikipedia

    en.wikipedia.org/wiki/Householder_transformation

    Now Q x = x (1 – a (u* x)) - e (b (u* x)). For the coefficient of the vector x to be zero, the two terms in u* x must have the same phase within a multiple of 180 degrees, so we must have arg(b) = arg(e* x) within a multiple of 180 degrees. There are two solutions according to whether an even or odd multiple of 180 degrees is chosen.