| 1. | In this way the propositional calculus can be discarded entirely.
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| 2. | The underlying logic is classical propositional calculus and classical predicate calculus with equality.
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| 3. | This is expressed in a propositional calculus as logical equivalence of certain compound statements.
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| 4. | Our propositional calculus has ten inference rules.
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| 5. | Modal logic also offers a variety of inferences that cannot be captured in propositional calculus.
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| 6. | It is not that these rules are contentious, when applied in conventional propositional calculus.
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| 7. | In fact the sign comes into the propositional calculus when a formula is to be evaluated.
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| 8. | RHS ( in propositional calculus ), then LHS = RHS ( in Boolean algebra ).
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| 9. | Classical propositional calculus as described above is equivalent to intuitionistic propositional calculus is equivalent to Heyting algebra.
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| 10. | Classical propositional calculus as described above is equivalent to intuitionistic propositional calculus is equivalent to Heyting algebra.
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