منابع مشابه
Involution Matrices of Real Quaternions
An involution or anti-involution is a self-inverse linear mapping. In this paper, we will present two real quaternion matrices, one corresponding to a real quaternion involution and one corresponding to a real quaternion anti-involution. Moreover, properties and geometrical meanings of these matrices will be given as reflections in R^3.
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متن کاملCounting occurrences of 231 in an involution
We study the generating function for the number of involutions on n letters containing exactly r 0 occurrences of 231. It is shown that finding this function for a given r amounts to a routine check of all involutions of length at most 2r + 2. © 2006 Elsevier B.V. All rights reserved.
متن کاملCounting Occurrences of 3412 in an Involution
We study the generating function for the number of involutions on n letters containing exactly r ≥ 0 occurrences of 3412. It is shown that finding this function for a given r amounts to a routine check of all involutions on 2r + 1 letters. 2000 Mathematics Subject Classification: Primary 05A05, 05A15; Secondary 05C90
متن کاملAn Exotic Nematode Parasite
We investigated reports from commercial fishers of parasitized American eels (Anguilla rostrata) in the Patuxent River (located in the mid-Chesapeake Bay) and discovered that some eels were infected with an exotic swim bladder nematode, Anguillicola crassus. Here, we (1) describe the dispersal of this blood-feeding nematode, endemic to the Japanese eel (A. japonica), in Europe and North America...
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ژورنال
عنوان ژورنال: Topology
سال: 1979
ISSN: 0040-9383
DOI: 10.1016/0040-9383(79)90015-6