In today's post Paul Noordhof presents his book, A Variety of Causes (OUP 2020). A Variety of Causes began life as an attempt to defend a counterfactual theory of causation that covered cases of indeterminism. Its basic tools were counterfactuals like ‘if e1 were not to occur, e2 would not occur’ (where e1 and e2 are token events) and appeals to probability in the consequent of the counterfactual (so p(e2) rather than e2) to characterise a notion of chance-raising. A successful defence requires a treatment of counterfactuals, identifying the conditions under which they are true and, for the enthusiast, that means I developed further Lewis’s similarity weighting for counterfactuals placing restrictions on the requirement for perfect match and clarifying the approximate match condition. More complex counterfactuals were needed to deal with cases of ‘redundant’ causation, like the situation in which one cause pre-empts another candidate cause. The book defends a particular way of
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