Properties of Context-sensitive Languages
- The union, intersection, concatenation and kleene star of two context-sensitive languages is context-sensitive.
- The complement of a context-sensitive language is itself context-sensitive.
- Every context-free language is context-sensitive.
- Membership of a string in a language defined by an arbitrary context-sensitive grammar, or by an arbitrary deterministic context-sensitive grammar, is a PSPACE-complete problem.
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