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Co-authored-by: Chris Henson <46805207+chenson2018@users.noreply.github.com>
Co-authored-by: Chris Henson <46805207+chenson2018@users.noreply.github.com>
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Adds logical equivalence for modal logic, proving that it is a
Congruence(for any modal logic, regardless of the class of models considered) and aLogicalEquivalence(for logic K, i.e., when considering the class of all models).The PR also renames
Proposition.negtoProposition.notand adds a useful lemma onProposition.iff.Depends on #528.