set of separability
41Mercer's theorem — In mathematics, specifically functional analysis, Mercer s theorem is a representation of a symmetric positive definite function on a square as a sum of a convergent sequence of product functions. This theorem, presented in (Mercer 1909), is one… …
42Axiom of countability — In mathematics, an axiom of countability is a property of certain mathematical objects (usually in a category) that requires the existence of a countable set with certain properties, while without it such sets might not exist. Important… …
43Feature selection — Feature selection, also known as variable selection, feature reduction, attribute selection or variable subset selection, is the technique, commonly used in machine learning, of selecting a subset of relevant features for building robust learning …
44Branched covering — In mathematics, branched covering is a term mainly used in algebraic geometry, to describe morphisms f from an algebraic variety V to another one W , the two dimensions being the same, and the typical fibre of f being of dimension 0.In that case …
45Disjunction — (Roget s Thesaurus) < N PARAG:Disjunction >N GRP: N 1 Sgm: N 1 disjunction disjunction disconnection disunity disunion disassociation disengagement Sgm: N 1 discontinuity discontinuity &c. 70 Sgm: N 1 abjunction abjunction Sgm …
46Action (physics) — In physics, the action is a particular quantity in a physical system that can be used to describe its operation. Action is an alternative to differential equations. The action is not necessarily the same for different types of systems.The action… …
47Quantum computer — A quantum computer is a device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. In a classical (or conventional) computer, information is… …
48Sorgenfrey plane — In topology, the Sorgenfrey plane is a frequently cited counterexample to many otherwise plausible sounding conjectures. It consists of the product of two copies of the Sorgenfrey line, which is the real line R under the half open interval… …
49Multigrid method — Multigrid (MG) methods in numerical analysis are a group of algorithms for solving differential equations using a hierarchy of discretizations. They are an example of a class of techniques called multiresolution methods, very useful in (but not… …
50Hückel method — The Hückel method or Hückel molecular orbital method (HMO) proposed by Erich Hückel in 1930, is a very simple linear combination of atomic orbitals molecular orbitals (LCAO MO) method for the determination of energies of molecular orbitals of pi… …
