The definition of producer-product concept.
An object x of class X in an environment z of class Z at time t1, is the producer of another object w - the product - of class W in an environment y of class Y at a later time t2 if x in z at t1, is necessary but insufficient for w in y at t2.
Producer-product is thus a special case of cause-effect. It applies when we consider the relationship between parts of time-slices (such as objects) rather than time-slices as wholes. An acorn, which was shown to be necessary but insufficient for an oak, is thus a producer of an oak, its product. (PS 22)
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