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   on almost recognizability by spectrum of simple classical groups  
   
نویسنده staroletov alexey
منبع international journal of group theory - 2017 - دوره : 6 - شماره : 4 - صفحه:7 -33
چکیده    ‎the set of element orders of a finite group $g$ is called the {em spectrum}‎. ‎groups with coinciding spectra are said to be {em isospectral}‎. ‎it is known that if $g$ has a nontrivial normal soluble subgroup then there exist infinitely many pairwise non-isomorphic‎ ‎groups isospectral to $g$‎. ‎the situation is quite different if $g$ is a nonabelain simple group‎. ‎recently it was proved that if $l$ is a simple classical group of dimension at least 62 and $g$ is a finite group‎ ‎isospectral to $l$‎, ‎then up to isomorphism $lleq gleqaut l$‎. ‎we show that the assertion remains true‎ ‎if 62 is replaced by 38‎.
کلیدواژه simple classical groups ,element orders ,prime graph of a finite group ,almost recognizable group.
آدرس sobolev institute of mathematics, russia. novosibirsk state university, department of mechanics and mathematics, russia
پست الکترونیکی staroletov@math.nsc.ru
 
     
   
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