Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site ssc-vax.UUCP
Path: utzoo!linus!decvax!harpo!eagle!mhuxl!mhuxm!pyuxi!pyuxnn!pyuxmm!cbdkc1!cbosgd!ihnp4!drux3!hogpc!houti!ariel!vax135!cornell!uw-beaver!ssc-vax!eder
From: eder@ssc-vax.UUCP
Newsgroups: net.space
Subject: Re: laser-water rockets?
Message-ID: <580@ssc-vax.UUCP>
Date: Fri, 28-Oct-83 15:25:16 EST
Article-I.D.: ssc-vax.580
Posted: Fri Oct 28 15:25:16 1983
Date-Received: Thu, 3-Nov-83 03:12:30 EST
References: <415@houca.UUCP>
Organization: Boeing Aerospace, Seattle
Lines: 25


                                               28 October 1983

     Laser propelled rockets have been studied by NASA and aerospace
contractors in the past.  For the ground-to-orbit regime, the design is
rather simple in principle (note that a rocket is simple in principle too)
What you have is a block of solid material, such as wax or ice, with some
black material in it (i.e. it absorbs the wavelength the laser operates atihnp4!houxm!hogpc!houti!ariel!vax135!cornell!uw-beaver!uw-june!eli
From: eli@uw-june.UUCP
Newsgroups: net.math
Subject: New question about primes
Message-ID: <694@uw-june>
Date: Fri, 28-Oct-83 17:28:37 EST
Article-I.D.: uw-june.694
Posted: Fri Oct 28 17:28:37 1983
Date-Received: Mon, 31-Oct-83 03:52:04 EST
Organization: U. Washington, Computer Sci
Lines: 12

I was wondering if anyone had a >simple< proof of the following fact,

    For all n > 0, there exists a prime, p, such that n <= p <=2n

I already have a rather complicated proof based on the Prime Number 
Theorem... I'm looking for an easier one -- possibly based on the sieve
of Aristophenes.

Please mail to me.  I will chew, digest and post.


	... uw-june!eli
1828
Relay-Version: version B 2.10.1 6/24/83; site linus.UUCP
Posting-Version: version B 2.10.1 6/24/83; s