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  2. Positive and negative parts - Wikipedia

    en.wikipedia.org/wiki/Positive_and_negative_parts

    The converse, though, does not necessarily hold: for example, taking f as =, where V is a Vitali set, it is clear that f is not measurable, but its absolute value is, being a constant function. The positive part and negative part of a function are used to define the Lebesgue integral for a real-valued function.

  3. Landau damping - Wikipedia

    en.wikipedia.org/wiki/Landau_damping

    In an ideal magnetohydrodynamic (MHD) plasma the particle velocities are often taken to be approximately a Maxwellian distribution function. If the slope of the function is negative, the number of particles with velocities slightly less than the wave phase velocity is greater than the number of particles with velocities slightly greater.

  4. Negative definiteness - Wikipedia

    en.wikipedia.org/wiki/Negative_definiteness

    In mathematics, negative definiteness is a property of any object to which a bilinear form may be naturally associated, which is negative-definite. See, in particular: Negative-definite bilinear form; Negative-definite quadratic form; Negative-definite matrix; Negative-definite function

  5. Nearly 30% of US drugstores closed in one decade, study shows

    www.aol.com/nearly-30-us-drugstores-closed...

    Black and Latino neighborhoods were most vulnerable to the retail pharmacy closures, which can chip away at already-limited care options in those communities, researchers said in a study published ...

  6. Report: Title IX complaint filed against Florida men's ... - AOL

    www.aol.com/sports/report-title-ix-complaint...

    Florida men’s basketball coach Todd Golden is reportedly accused of multiple instances of sexual harassment and stalking. According to Florida’s student newspaper The Alligator, a formal Title ...

  7. Girl accused in Wisconsin school deaths joins short list of ...

    www.aol.com/news/girl-accused-wisconsin-school...

    The fatal shooting of a student and a teacher at a private Christian school in Wisconsin on Monday was laden with shock, even for a nation dulled by the horror of repeated school massacres.

  8. Hessian matrix - Wikipedia

    en.wikipedia.org/wiki/Hessian_matrix

    The determinant of the Hessian matrix, when evaluated at a critical point of a function, is equal to the Gaussian curvature of the function considered as a manifold. The eigenvalues of the Hessian at that point are the principal curvatures of the function, and the eigenvectors are the principal directions of curvature.

  9. Signed measure - Wikipedia

    en.wikipedia.org/wiki/Signed_measure

    What follows are two results which will imply that an extended signed measure is the difference of two non-negative measures, and a finite signed measure is the difference of two finite non-negative measures. The Hahn decomposition theorem states that given a signed measure μ, there exist two measurable sets P and N such that: P∪N = X and P ...