Abstract: The orthodox view of the fundamentals of causality can be traced
back to the empiricist philosophy of David Hume. Hume said that for causality
to occur, the cause and effect must be spatially together, the cause must occur
before the effect and must always be followed by that type of effect. Hume also
thought that our concept of cause included necessity, but he rejected this as
unjustified by the evidence of our sense. We show how all four of these
conceptual assumptions about what it is for one this to cause another can be
challenged. An alternative view based on real powers or dispositions can allow
causation without necessity, constant conjunction, temporal priority, or even contiguity.
Keywords: Cause, David Hume, powers, complexity, threshold