 Another approach to the notion of relevance is in terms of the idea that the antecedent of a conditional should make a difference to the truth, assertability or probability of the consequent. Consider a conditional like “if London is in England, then Aristotle was a Greek philosopher”. The conditional sounds odd because the truth of the antecedent does not matter to the truth of the consequent. While relevant logics capture the idea of relevance in terms of topic-sharing, here the idea of relevance is captured in terms of the difference that the antecedent makes for the consequent.