Text: More surprisingly, there is not a single mention of the most important public event for Degas during the 1890s, the Dreyfus affair, when Degas didn't just look like a dog but behaved like one, cutting off Jewish friends of long standing and adamantly insisting (along with Paul Cezanne and Renoir) on the guilt of the Jewish army officer falsely accused of treason.
Entailment: Not a single mention of the most imporatnt public event for Degas during the 1890s can be found.
Contradiction: The Jewish army officer was accused of treason on provable grounds.