Re: poly: Seeking StarFlight Functional Forms

From: Robin Hanson <>
Date: Thu Feb 05 1998 - 12:19:24 PST

Damien asks:
>Care to tell us your reasons? It might help get us into the spirit of
>> R(s) = exp(lnR(s)), lnR'(s) = lnR0 - lnRd*s.
>> A(x) = exp(lnA(x)), lnA'(x) = lnA0 + lnAd*x.
>I've having trouble with these two. R=exp(ln(R))? R=R? I assume R' is
>R-prime, or dR/dt. (Or dR/ds, I suppose.)

"lnR" is a distinct symbol naming a new function. The equation
says that the (exponential) growth rate declines linearly with time for R.
For A the exponential kill rate increases linearly with distance. With
more distance,not only might you hit a big object in your path, but the
accumulation of small hits over your whole flight might finally kill you off.

Robin Hanson
RWJF Health Policy Scholar, Sch. of Public Health 510-643-1884
140 Warren Hall, UC Berkeley, CA 94720-7360 FAX: 510-643-8614
Received on Thu Feb 5 20:22:38 1998

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