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on almost recognizability by spectrum of simple classical groups
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نویسنده
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staroletov alexey
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منبع
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international journal of group theory - 2017 - دوره : 6 - شماره : 4 - صفحه:7 -33
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چکیده
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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.
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کلیدواژه
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simple classical groups ,element orders ,prime graph of a finite group ,almost recognizable group.
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آدرس
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sobolev institute of mathematics, russia. novosibirsk state university, department of mechanics and mathematics, russia
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پست الکترونیکی
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staroletov@math.nsc.ru
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Authors
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