منابع مشابه
On Dowling geometries of infinite groups
A finite subgeometry of a Dowling geometry for an infinite group is exhibited, which cannot be embedded in a Dowling geometry for any finite group; this provides a negative answer to a question of Bonin. The question addressed herein is motivated by the following fundamental result of Rado, concerning the embeddability of finite geometries in projective geometries [Ra, Theorem 4]: Theorem. Ever...
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متن کاملComparison of Hardness Values of Various specimens with different geometries and material properties after ECAP
Nowadays, equal channel angular pressing, known as the ECAP process, is one of the most popular methods for manufacturing ultra-fine grained (UFG) materials. In this paper, Ecap process has been carried out on pure copper and 6012 aluminum alloy up to six passes by route . Principal attention was paid to the influence of parameters such as diameter, material, and the height of billet on mechani...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1914
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1914-02463-2