نتایج جستجو برای: primitive group

تعداد نتایج: 1012415  

1996
Victor Mitrana

A word is called primitive if it cannot be expressed as the power of another word. Morphisms preserving primitive words are investigated. Similarly to the word case, each square-free morphism is a primitive morphism but the converse does not hold. A precise characterization of primitive morphisms is provided in terms of pure codes. An easily testable characterization is given for uniform morphi...

In this paper, we describe the primitive ideal space of the $C^*$-algebra $C^*(mathcal G)$  associated to the ultragraph $mathcal{G}$. We investigate the structure of the closed ideals of the quotient ultragraph $  C^* $-algebra  $C^*left(mathcal G/(H,S)right)$ which contain no nonzero set projections and then we characterize all non gauge-invariant primitive ideals. Our results generalize the ...

Journal: :J. Comb. Theory, Ser. A 2005
Eugenia O'Reilly Regueiro

We present some results on flag-transitive symmetric designs. First we see what conditions are necessary for a symmetric design to admit an imprimitive, flag-transitive automorphism group. Then we move on to study the possibilities for a primitive, flag-transitive automorphism group, and prove that for λ ≤ 3, the group must be affine or almost simple, and finally we analyse the case in which a ...

Journal: :nephro-urology monthly 0
ivan zokalj department of radiology, county hospital cakovec, cakovec, croatia; department of radiology, county hospital cakovec, cakovec, croatia jasminka igrec department of radiology, county hospital cakovec, cakovec, croatia antonio plesnar department of surgery, division of urology, county hospital cakovec, cakovec, croatia

conclusions pnet/ews should be included in the differential diagnosis of renal tumors in symptomatic young adults. patients with localised pnet/ews treated with a combination of surgery and chemotherapy have an excellent chance of long-term survival, as in the case we have presented. introduction primitive neuroectodermal tumor (pnet)/ewing’s sarcoma (ews) belongs to a family of neoplasms that ...

احمدی, عباس , بختیاری, زهرا , سلطانعلی نژاد, فرهاد, شهروز, رسول,

Background and purpose: Oxidative stress induced by cyclophosphamide (CP), a chemotherapeutic agent, causes vulnerability of sperm and declining the fertility power. Then in this study the effect of crocin (saffron extract) on amelioration of these side effects was investigated. Materials and methods: In this study 24 adult male mice were divided in three groups (n=8). Control group received n...

2001
Donghi Lee DONGHI LEE

An endomorphism φ of a free group is called primitivity preserving if φ takes every primitive element to another primitive. In this paper we prove that every primitivity preserving endomorphism of a free group of a finite rank n ≥ 3 is an automorphism.

Journal: :The New England journal of medicine 2003
Holcombe E Grier Mark D Krailo Nancy J Tarbell Michael P Link Christopher J H Fryer Douglas J Pritchard Mark C Gebhardt Paul S Dickman Elizabeth J Perlman Paul A Meyers Sarah S Donaldson Sheila Moore Aaron R Rausen Teresa J Vietti James S Miser

BACKGROUND Ewing's sarcoma and primitive neuroectodermal tumor of bone are closely related, highly malignant tumors of children, adolescents, and young adults. A new drug combination, ifosfamide and etoposide, was highly effective in patients with Ewing's sarcoma or primitive neuroectodermal tumor of bone who had a relapse after standard therapy. We designed a study to test whether the addition...

2016
Benson Farb Sebastian Hensel SEBASTIAN HENSEL

Consider a finite, regular cover Y → X of finite graphs, with associated deck group G. We relate the topology of the cover to the structure of H1(Y ;C) as a G-representation. A central object in this study is the primitive homology group H 1 (Y ;C) ⊆ H1(Y ;C), which is the span of homology classes represented by components of lifts of primitive elements of π1(X). This circle of ideas relates co...

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشکده علوم زمین سازمان زمین شناسی و اکتشافات مع 1390

the neogene intrusion masses in the noudeh-enghelab area located to the north of sabzevar ophiolite have cut the late cretaceous ophiolitic rocks, sedimentary- volcanic and eocene volcanic rocks and have been covered by pliocene and quaternary deposits. the margin is of lava with basalt, phyric andesite-basalt and andesite and the central parts (dome shaped) composed of phyric andesite-trachyan...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم انسانی 1392

this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...

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