invariant
111Normally hyperbolic invariant manifold — A normally hyperbolic invariant manifold (NHIM) is a natural generalization of a hyperbolic fixed point and a hyperbolic set. The difference can be described heuristically as follows: For a manifold Λ to be normally hyperbolic we are allowed to… …
112Quasi-invariant measure — In mathematics, a quasi invariant measure mu; with respect to a transformation T , from a measure space X to itself, is a measure which, roughly speaking, is multiplied by a numerical function by T . An important class of examples occurs when X… …
113Writer invariant — Writer invariant, also called authorial invariant or author s invariant, is property of a text which is invariant of its author, that is, it will be similar in all texts of a given author and different in texts of different authors. It can be… …
114Lagrange invariant — In optics the Lagrange invariant is a measure of the light propagating through an optical system. It is defined by , where y and u are the marginal ray height and angle respectively, and ȳ and ū are the chief ray height and angle. n is the… …
115Laplace invariant — In differential equations, the Laplace invariant of any of certain differential operators is a certain function of the coefficients and their derivatives. Consider a bivariate hyperbolic differential operator of the second order:partial x ,… …
116Seiberg–Witten invariant — In mathematics, Seiberg–Witten invariants are invariants of compact smooth 4 manifolds introduced by harvtxt|Witten|1994, using the Seiberg Witten theory studied by harvs|txt=yes|last=Seiberg|last2=Witten|year1=1994a|year2=1994b during their… …
117Scale-invariant feature transform — (engl., „skaleninvariante Merkmalstransformation“, kurz SIFT) ist ein Algorithmus zur Extraktion lokaler Bildmerkmale aus Abbildungen. Er kann vor allem bei der Bilderkennung verwendet werden. Er wurde von David G. Lowe an der University of… …
118Modular invariant of a group — In mathematics, a modular invariant of a group is an invariant of a finite group acting on a vector space of positive characteristic (usually dividing the order of the group). The study of modular invariants was originated in about 1914 by… …
119Curvature invariant (general relativity) — Curvature invariants in general relativity are a set of scalars called curvature invariants that arise in general relativity. They are formed from the Riemann, Weyl and Ricci tensors which represent curvature and possibly operations on them such… …
120Hasse invariant — In mathematics, Hasse invariant may be*Hasse invariant of an elliptic curve *Hasse invariant of a quadratic form …
