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  2. Hilbert space - Wikipedia

    en.wikipedia.org/wiki/Hilbert_space

    Associated to every simple tensor product x 1 ⊗ x 2 is the rank one operator from H ∗ 1 to H 2 that maps a given x* ∈ H ∗ 1 as (). This mapping defined on simple tensors extends to a linear identification between H 1 ⊗ H 2 and the space of finite rank operators from H ∗ 1 to H 2.

  3. Travelling salesman problem - Wikipedia

    en.wikipedia.org/wiki/Travelling_salesman_problem

    By the triangle inequality, the best Eulerian graph must have the same cost as the best travelling salesman tour; hence, finding optimal Eulerian graphs is at least as hard as TSP. One way of doing this is by minimum weight matching using algorithms with a complexity of O ( n 3 ) {\displaystyle O(n^{3})} .

  4. Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_theorem

    Let ABC be a triangle with side lengths a, b, and c, with a 2 + b 2 = c 2. Construct a second triangle with sides of length a and b containing a right angle. By the Pythagorean theorem, it follows that the hypotenuse of this triangle has length c = √ a 2 + b 2, the same as the hypotenuse of the first triangle.

  5. Bell's theorem - Wikipedia

    en.wikipedia.org/wiki/Bell's_theorem

    Such a constraint would later be named a Bell inequality. Bell then showed that quantum physics predicts correlations that violate this inequality . Multiple variations on Bell's theorem were put forward in the following years, using different assumptions and obtaining different Bell (or "Bell-type") inequalities.

  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. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Geometry is one of the oldest branches of mathematics. It started with empirical recipes concerning shapes, such as lines , angles and circles , which were developed mainly for the needs of surveying and architecture , but has since blossomed out into many other subfields.

  8. Arithmetic mean - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_mean

    Proof without words of the AM–GM inequality: PR is the diameter of a circle centered on O; its radius AO is the arithmetic mean of a and b. Using the geometric mean theorem, triangle PGR's altitude GQ is the geometric mean. For any ratio a:b, AO ≥ GQ.

  9. Von Neumann entropy - Wikipedia

    en.wikipedia.org/wiki/Von_Neumann_entropy

    [67] [68] The subadditivity and triangle inequalities were proved in 1970 by Huzihiro Araki and Elliott H. Lieb. [69] Strong subadditivity is a more difficult theorem. It was conjectured by Oscar Lanford and Derek Robinson in 1968. [70] Lieb and Mary Beth Ruskai proved the theorem in 1973, [71] [72] using a matrix inequality proved earlier by ...

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