Abstract
Leftist grammars were introduced by Motwani et. al. [7], as a tool to show decidability of the accessibility problem in certain general protection systems. It is shown that the membership problem for languages defined by leftist grammars is non-primitive recursive. Therefore, by the reduction of Motwani et. al., the accessibility problem in the appropriate protection systems is non-primitive recursive as well.KeywordsProtection SystemTuring MachineProduction RuleDerivation StepInput WordThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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