Perhaps that wikipedia article will help. Here's some of it:
The notion of causation is closely linked to the problem of induction. According to Hume, we reason inductively by associating constantly conjoined events, and it is the mental act of association that is the basis of our concept of causation. There are three main interpretations of Hume's theory of causation represented in the literature: (1) the logical positivist; (2) the skeptical realist; and (3) the quasi-realist.
The logical positivist interpretation is that Hume analyses causal propositions, such as "A caused B," in terms of regularities in perception: "A caused B" is equivalent to "Whenever A-type events happen, B-type ones follow," where "whenever" refers to all possible perceptions.[31]
This view is rejected by skeptical realists, who argue that Hume thought that causation amounts to more than just the regular succession of events.[32] When two events are causally conjoined, there is a necessary connection which underpins the conjunction...
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