 We write \(\leq_a\) (“no less plausible than”) for the converse plausibility relation: \(w\leq_a v\) means that \(v\geq_a w\). Also, we define the strict plausibility relation \(\gt_a\) (“strictly more plausible than”) in the usual way: \(w\gt_a v\) means that we have \(w\geq_a v\) and \(v\ngeq_a w\). (A slash through the relation means the relation does not hold.) The strict converse plausibility relation \(\lt_a\) (“strictly less plausible than”) is defined as expected: \(w\lt_a v\) means that \(v\gt_a w\). Finally, we define the equi-plausibility relation \(\simeq_a\) (“equally plausible”) as follows: \(w\simeq_a v\) means that we have \(w\geq_a v\) and \(v\geq_a w\). 