Subnormality, ascendancy and projectivities
In 1939, Wielandt introduced the concept of subnormality and proved that in a finite group, the join of the two (and hence any number of) subnormal subgroups is again subnormal. This result does not hold for arbitrary groups. After much work by various authors, Williams gave necessary and sufficient...
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University of Warwick
1987
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| Online Access: | http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235221 |