geometric point
51Isotopy of loops — Isotopy of quasigroups = Let (Q,cdot) and (P,circ) be quasigroups. A quasigroup homotopy from Q to P is a triple (α, β, γ) of maps from Q to P such that :alpha(x)circeta(y) = gamma(xcdot y),for all x , y in Q . A quasigroup homomorphism is just… …
52Perturbation theory (quantum mechanics) — In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a …
53Past — The past is the portion of time that has already occurred; [Hegeler, E. C., Carus, P. (1890). [http://books.google.com/books?id=3KoLAAAAIAAJ The Monist] . La Salle, Ill. [etc.] : Published by Open Court for the Hegeler Institute. page 443. ] it… …
54Atomic orbital — The shapes of the first five atomic orbitals: 1s, 2s, 2px, 2py, and 2pz. The colors show the wave function phase. These are graphs of ψ(x,y,z) functions which depend on the coordinates of one electron. To see the elongated shape of ψ(x,y,z)2… …
55Local field — In mathematics, a local field is a special type of field that is a locally compact topological field with respect to a non discrete topology.[1] Given such a field, an absolute value can be defined on it. There are two basic types of local field …
56Generalized flag variety — In mathematics, a generalized flag variety (or simply flag variety) is a homogeneous space whose points are flags in a finite dimensional vector space V over a field F. When F is the real or complex numbers, a generalized flag variety is a smooth …
57Presentism (philosophy of time) — In the philosophy of time, presentism is the belief that only the present exists and the future and the past are unreal. Past and future entities are to be construed as logical constructions or fictions. The opposite of presentism is eternalism …
58Schottky problem — In mathematics, the Schottky problem is a classical question of algebraic geometry, asking for a characterisation of Jacobian varieties amongst abelian varieties.Geometric formulationMore precisely, one should consider algebraic curves C of a… …
59Concepts in the Ender's Game series — This is a list of miscellaneous elements in the Ender s Game series of books by Orson Scott Card. Contents 1 Aiùa 2 Ansible 3 Anton s Key 4 Descolada …
60Suspension (vehicle) — Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Suspension systems serve a dual purpose – contributing to the car s handling and braking for good active safety and driving …
