ABSTRACT
Opportunities. As I indicated in the previous section, I view causation as a relationship between events. The first step down this path is to define the collection £1 of all opportunities for events to occur. A typical element of £i is written ox Q and co are the Greek capital and lower case omega, which we can identify with the word "opportunity". An event is nothing more than a subset of Q. The elements of the set are the opportunities at which the event "happened", and those outside the set are those opportunities where it didn't.
