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  2. Critical point (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Critical_point_(mathematics)

    For a function of n variables, the number of negative eigenvalues of the Hessian matrix at a critical point is called the index of the critical point. A non-degenerate critical point is a local maximum if and only if the index is n, or, equivalently, if the Hessian matrix is negative definite; it is a local minimum if the index is zero, or ...

  3. Morse theory - Wikipedia

    en.wikipedia.org/wiki/Morse_theory

    A less trivial example of a degenerate critical point is the origin of the monkey saddle. The index of a non-degenerate critical point of is the dimension of the largest subspace of the tangent space to at on which the Hessian is negative definite.

  4. Hessian matrix - Wikipedia

    en.wikipedia.org/wiki/Hessian_matrix

    Otherwise it is non-degenerate, and called a Morse critical point of . The Hessian matrix plays an important role in Morse theory and catastrophe theory, because its kernel and eigenvalues allow classification of the critical points. [2] [3] [4]

  5. Critical phenomena - Wikipedia

    en.wikipedia.org/wiki/Critical_phenomena

    The critical point is described by a conformal field theory. According to the renormalization group theory, the defining property of criticality is that the characteristic length scale of the structure of the physical system, also known as the correlation length ξ, becomes infinite. This can happen along critical lines in phase space.

  6. Non-degenerate critical point - Wikipedia

    en.wikipedia.org/?title=Non-degenerate_critical...

    Retrieved from "https://en.wikipedia.org/w/index.php?title=Non-degenerate_critical_point&oldid=29046177"

  7. Stationary phase approximation - Wikipedia

    en.wikipedia.org/wiki/Stationary_phase_approximation

    The second statement is that when f is a Morse function, so that the singular points of f are non-degenerate and isolated, then the question can be reduced to the case n = 1. In fact, then, a choice of g can be made to split the integral into cases with just one critical point P in each.

  8. Critical variable - Wikipedia

    en.wikipedia.org/wiki/Critical_variable

    Critical variables are defined, for example in thermodynamics, in terms of the values of variables at the critical point. On a PV diagram, the critical point is an inflection point . Thus: [ 1 ]

  9. Ostrogradsky instability - Wikipedia

    en.wikipedia.org/wiki/Ostrogradsky_instability

    The main points of the proof can be made clearer by considering a one-dimensional system with a Lagrangian (, ˙, ¨).The Euler–Lagrange equation is ˙ + ¨ = Non-degeneracy of means that the canonical coordinates can be expressed in terms of the derivatives of and vice versa.