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*To*: starship-design@lists.uoregon.edu (Starship list)*Subject*: Re: starship-design: FTL*From*: kuo@bit.csc.lsu.edu (Isaac Kuo)*Date*: Thu, 28 Aug 1997 19:17:13 -0500 (CDT)*In-Reply-To*: <01BCB3DC.8C9540E0.lparker@cacaphony.net> from "L. Parker" at Aug 28, 97 11:36:50 am*Reply-To*: kuo@bit.csc.lsu.edu (Isaac Kuo)*Sender*: owner-starship-design

L. Parker wrote: >I don't really have a problem with relativity, unless it starts violating >causality. Even Einstein had a problem with what he called "spooky action >at a distance" and that was merely simultaneous - not an actual violation >of causality. I just don't think it is possible to create a causality >violation, with or without FTL. (If you can do it with FTL then FTL isn't >possible.) One thing is for sure--a _true_ causality violation is impossible. It is a mathematical impossibility to truly kill your own grandfather so he never fathered your father. It's as impossible as assigning a true/false value to the statement, "This statement is false." or finding a real number x such that x^2 is -1. However, just as it is possible to invent logic systems with more than true/false, and just as it is possible to extend to complex numbers where i^2 = -1, it might be possible that the universe is modeled by an extention of what we normally think of as causality (the solution to a complex differential equation). It's possible, but not necessarily so. And note that just as with the other extensions I mention, this extension would be very bizarre compared to the "normal" case. BTW, the problem with differential equations is that sometimes no solution exists. What happens if the universe is modelled by a differential equation where no solution exists? Well...it can't happen--it's like asking what happens if there were a rational number whose square was 2. What really could happen is that using our understanding of physics, our best mathematical models which best fit the universe might be a differential equation where no global solution exists--and our best model is by definition incomplete. -- _____ Isaac Kuo kuo@bit.csc.lsu.edu http://www.csc.lsu.edu/~kuo __|_)o(_|__ /___________\ "Mari-san... Yokatta... \=\)-----(/=/ ...Yokatta go-buji de..." - Karigari Hiroshi

**References**:**RE: starship-design: FTL***From:*"L. Parker" <lparker@cacaphony.net>

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