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True or false? If A is regular and A B than B must be regular; If A and AB are both regular then B must
True or false? If A is regular and A B than B must be regular; If A and AB are both regular then B must be regular; If {Ai|i belongs to N} is an infinite family of regular sets then union Ai is regular; If A is not regular it cannot have a regular subset. 
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Logidata+ Deductive Databases With Complex Objects Lncs 701
Authors: Paolo Atzeni
1st Edition
354056974X, 978-3540569749
