We construct an explicit example of a physical system having alternative futures (AFs). Several other such systems are also introduced and characterized, but not discussed in detail. Our major goal is to use these results to demonstrate the existence and meaning of the concept of counterfactual histories (CFHs). We find that any system having AFs will also exhibit the phenomenon of CFHs.
Mickens, Ronald E. and Patterson, Charmayne
"Systems Exhibiting Alternative Futures,"
Georgia Journal of Science, Vol. 75, No. 2, Article 4.
Available at: http://digitalcommons.gaacademy.org/gjs/vol75/iss2/4