unbounded element
21Club filter — In mathematics, particularly in set theory, if κ is a regular uncountable cardinal then , the filter of all sets containing a club subset of κ, is a κ complete filter closed under diagonal intersection called the club filter. To see that this is… …
22Spectrum (functional analysis) — In functional analysis, the concept of the spectrum of a bounded operator is a generalisation of the concept of eigenvalues for matrices. Specifically, a complex number λ is said to be in the spectrum of a bounded linear operator T if… …
23Decomposition of spectrum (functional analysis) — In mathematics, especially functional analysis, the spectrum of an operator generalizes the notion of eigenvalues. Given an operator, it is sometimes useful to break up the spectrum into various parts. This article discusses a few examples of… …
24Regular expression — In computing, a regular expression provides a concise and flexible means for matching (specifying and recognizing) strings of text, such as particular characters, words, or patterns of characters. Abbreviations for regular expression include… …
25Vector space — This article is about linear (vector) spaces. For the structure in incidence geometry, see Linear space (geometry). Vector addition and scalar multiplication: a vector v (blue) is added to another vector w (red, upper illustration). Below, w is… …
26Opérateur adjoint — En mathématiques l adjoint d un opérateur, quand il existe, est un nouvel opérateur défini sur un espace vectoriel sur le corps des nombres réels ou complexes, muni d un produit scalaire. Un tel espace est qualifié de préhilbertien. Si l… …
27Metrical phonology — is a theory of stress or linguistic prominence.[1] [2] The innovative feature of this theory is that the prominence of a unit is defined relative to other units in the same phrase. For example, in the most common pronunciation of the phrase… …
28Pythagoreans and Eleatics — Edward Hussey PYTHAGORAS AND THE EARLY PYTHAGOREANS Pythagoras, a native of Samos, emigrated to southern Italy around 520, and seems to have established himself in the city of Croton. There he founded a society of people sharing his beliefs and… …
29Real closed field — In mathematics, a real closed field is a field F in which any of the following equivalent conditions are true:#There is a total order on F making it an ordered field such that, in this ordering, every positive element of F is a square in F and… …
30Dzogchen — This article is about the primordial state in Tibetan Buddhism and Bön. For the monastery, see Dzogchen Monastery. Dzogchen Tibetan name Tibetan: རྫོགས་ཆེན་ Wylie transliteration: rdzogs chen (rdzogs pa chen po) …
