Fix: the clustering for expressions that contain 'not (A and B)', 'not (A or B)'#27
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vsavkov wants to merge 1 commit into
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Fix: the clustering for expressions that contain 'not (A and B)', 'not (A or B)'#27vsavkov wants to merge 1 commit into
vsavkov wants to merge 1 commit into
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not (A or B) = (not A) and (not B); not (A and B) = (not A) or (not B).
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It was observed that for expressions that contain 'not (A and B)' or 'not (A or B)' clauses
the clustering is performed such way that
during matching step of the search the expressions containing the 'not (A and B)' or 'not (A or B)' clauses could be excluded from the further evaluation despite the expressions be true.
The fix implements De Morgan's laws for variable bound calculation (clustering):
not (A or B) = (not A) and (not B);
not (A and B) = (not A) or (not B).
Tests 'test_cdir_not_and' and 'test_cdir_not_or' verify the implementation.