منابع مشابه
on semihypergroups and hypergroups
in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...
15 صفحه اولReynolds Operator on Functors
Let G = SpecA be an affine R-monoid scheme. We prove that the category of dual functors (over the category of commutative R-algebras) of G-modules is equivalent to the category of dual functors of A∗-modules. We prove that G is invariant exact if and only if A∗ = R × B∗ as R-algebras and the first projection A∗ → R is the unit of A. If M is a dual functor of G-modules and wG := (1, 0) ∈ R×B ∗ =...
متن کاملcompactifications and function spaces on weighted semigruops
chapter one is devoted to a moderate discussion on preliminaries, according to our requirements. chapter two which is based on our work in (24) is devoted introducting weighted semigroups (s, w), and studying some famous function spaces on them, especially the relations between go (s, w) and other function speces are invesigated. in fact this chapter is a complement to (32). one of the main fea...
15 صفحه اولCOMMENT Calanoid copepods: linking lower-higher trophic levels by linking lower-higher Reynolds numbers
The copepods are said to be the most abundant multicellular animals on earth, with an estimated species number of 11 500+ (Humes 1994). The most typical form of planktonic copepods in the oceans is the calanoids, which makes up >?Or% of all net-collected zooplankton (e.g. Lalli & Parsons 1993). Why are the calanoids so abundant and successful? A clue to the answer to this question is the size (...
متن کاملBirds and alien species dispersal: on the need to focus management efforts on primary introduction pathways – comment on Reynolds et al. and Green
Two articles published in Diversity and Distributions (Green, 2015; Reynolds et al., 2015) demonstrate the role of waterbirds in dispersing alien species and claim that this phenomenon has been largely neglected. Setting out priorities for the future, they focus on the need to improve our understanding of the problem if it is to be successfully managed. We argue that birds are vectors of the se...
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ژورنال
عنوان ژورنال: Psychonomic Science
سال: 1968
ISSN: 0033-3131,2197-9952
DOI: 10.3758/bf03342388