| 1. | SS2PL is a proper subset of the intersection of 2PL and strictness.
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| 2. | Unlike finite sets, some infinite sets are equinumerous to proper subsets of themselves.
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| 3. | In particular, 2-perfect numbers are a proper subset of \ mathcal { S }.
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| 4. | It looks like just an arbitrary proper subset of piperazines.
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| 5. | Unambiguous CFLs are a proper subset of all CFLs : there are inherently ambiguous CFLs.
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| 6. | The notion of an invariant proper subset ? is important; the so-called "'Picard group "'
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| 7. | Indexed languages are a proper subset of context-sensitive languages.
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| 8. | A "'maximal antichain "'is an antichain that is not a proper subset of any other antichain.
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| 9. | If is not reflexive, the unit ball of is a proper subset of the unit ball of.
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| 10. | Generally speaking, no proper subset of the space of distributions contains all continuous functions and is closed under differentiation.
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