Tim May writes: > One reason I like the recent scientific papers on causality, light > cones, universes, toposes, etc. is to move beyond the b.s. college bull > sessions about determinacy and suchlike.
Yes, there is a lot to be said for this perspective. In some cases, science is able to find concrete and testable answers to questions which have long been in the realm of philosophy. After all, science was originally called "natural philosophy". > A large literature on why time reversal is meaningful locally, but not > globally. Usual example of gas expanding from a cylinder to fill a room > versus reversed image of gas moving back into cylinder. > > (A couple of books: "The Physics of Time Asymmetry," P.C.W. Davies, > 1974, 1977, and "Asymmetries in Time," Paul Horwich, 1987.) Another good book on this topic, more philosophically oriented, is Huw Price's 'Time's Arrow and Archimedes's Point'. He has a web page at http://www.usyd.edu.au/philosophy/price/TAAP.html which has a chapter from the book and some reviews. This book actually made a good case for a notion which I had always thought to be absurd, namely that if the universe's expansion were to reverse and become a contraction leading up to a "big crunch", time might reverse in the contracting phase. Hal Finney