| 21. | The binary relation a " defined by
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| 22. | There is also a primitive binary relation called order, denoted by infix " < ".
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| 23. | According to the previous lemma, we can in fact use finitely many binary relation symbols.
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| 24. | Deduction rules can then be represented by binary relations on G�del numbers of lists of formulas.
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| 25. | Then the "'independency "'induced by D is the binary relation I
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| 26. | Define on the binary relation to hold when there exists a nonzero real number such that.
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| 27. | That is why any description of set theory begins with a fundamental binary relation ".
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| 28. | The new component R is a binary relation relating values in the domain to plural variable symbols.
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| 29. | Notice that a cycle is neither necessary nor sufficient for a binary relation to be not transitive.
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| 30. | Adding a single binary relation symbol to monadic logic, however, results in an undecidable logic.
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