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  2. Special linear group - Wikipedia

    en.wikipedia.org/wiki/Special_linear_group

    If working over a ring where SL is generated by transvections (such as a field or Euclidean domain), one can give a presentation of SL using transvections with some relations. Transvections satisfy the Steinberg relations , but these are not sufficient: the resulting group is the Steinberg group , which is not the special linear group, but ...

  3. Special linear Lie algebra - Wikipedia

    en.wikipedia.org/wiki/Special_linear_Lie_algebra

    The algebra plays an important role in the study of chaos and fractals, as it generates the Möbius group SL(2,R), which describes the automorphisms of the hyperbolic plane, the simplest Riemann surface of negative curvature; by contrast, SL(2,C) describes the automorphisms of the hyperbolic 3-dimensional ball.

  4. Dissipation factor - Wikipedia

    en.wikipedia.org/wiki/Dissipation_factor

    In physics, the dissipation factor (DF) is a measure of loss-rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. It is the reciprocal of quality factor , which represents the "quality" or durability of oscillation.

  5. SL2(R) - Wikipedia

    en.wikipedia.org/wiki/SL2(R)

    SL(2, R) is the group of all linear transformations of R 2 that preserve oriented area. It is isomorphic to the symplectic group Sp(2, R) and the special unitary group SU(1, 1). It is also isomorphic to the group of unit-length coquaternions. The group SL ± (2, R) preserves unoriented area: it may reverse orientation.

  6. Dissociation (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Dissociation_(chemistry)

    In case of very strong acids and bases, degree of dissociation will be close to 1. Less powerful acids and bases will have lesser degree of dissociation. There is a simple relationship between this parameter and the van 't Hoff factor. If the solute substance dissociates into ions, then

  7. Cholesky decomposition - Wikipedia

    en.wikipedia.org/wiki/Cholesky_decomposition

    In linear algebra, the Cholesky decomposition or Cholesky factorization (pronounced / ʃ ə ˈ l ɛ s k i / shə-LES-kee) is a decomposition of a Hermitian, positive-definite matrix into the product of a lower triangular matrix and its conjugate transpose, which is useful for efficient numerical solutions, e.g., Monte Carlo simulations.

  8. New test may detect Alzheimer's years before tau clumps ... - AOL

    www.aol.com/lifestyle/test-may-detect-alzheimers...

    Along similar lines, Owen told MNT that it’s important to differentiate between a biomarker and a risk factor. He explained that, regardless of the biomarkers you might have, if you do not ...

  9. Representation theory of SL2(R) - Wikipedia

    en.wikipedia.org/.../Representation_theory_of_SL2(R)

    It generates the center of the universal enveloping algebra of the complexified Lie algebra of SL(2, R). The Casimir element acts on any irreducible representation as multiplication by some complex scalar μ 2. Thus in the case of the Lie algebra sl 2, the infinitesimal character of an irreducible representation is specified by one complex number.