| 21. | The formal system of cardinal numerals, as used in Classical Arabic, is extremely complex.
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| 22. | There may be a formal system, with due process and the rule of law.
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| 23. | The basic objects of metalogical study are formal languages, formal systems, and their interpretations.
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| 24. | A formal system is used to derive one expression from one or more other expressions.
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| 25. | Propositional and predicate calculi are examples of formal systems.
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| 26. | *This is a fine example of a formal system.
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| 27. | A formal system might be syntactically incomplete by design : such as logics generally are.
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| 28. | The Russians want a formal system in place that could include inspections of weapons sites.
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| 29. | In a formal system a symbol may be used as a token in formal operations.
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| 30. | Mathematical logicians study formal systems but are just as often realists as they are formalists.
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