HP Forum Archive 19

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Two Interesting BigNum Stories (Via Slashdot) Message #1 Posted by Les Bell on 5 Jan 2010, 5:53 p.m. Surprised these weren't posted earlier, as they came via Slashdot yesterday. 1. HP Patents BigNum Implementation This one concerns a patent issued to HP, and specifically Cyrille de Brebisson. Apparently, there may be prior art which would invalidate the patent - specifically, in Knuth's "Semi-Numerical Algorithms" as well as other papers stretching back to 1912. The Slashdot story is at http://yro.slashdot.org/story/10/01/04/2321226/HP-Patents-Bignum-Implementation-From-1912?art_pos=23 and the patent itself is viewable at http://www.wikipatents.com/7523150.html-1. 2. Pi to 2.7 Trillion (Approx) Decimal Digits Now that's a BigNum! Slashdot discussion is at http://science.slashdot.org/story/10/01/05/006243/New-Pi-Computation-Record-Using-a-Desktop-PC?art_pos=19 while Fabrice Bellard's page on how he did it is at http://bellard.org/pi/pi2700e9/. Best, --- Les [http://www.lesbell.com.au]

Re: Two Interesting BigNum Stories (Via Slashdot) Message #2 Posted by Michael Meyer on 5 Jan 2010, 6:44 p.m., in response to message #1 by Les Bell Thanks! Interesting pi story. I liked how a guy with his home computer decided (and managed) to do this.

Re: Two Interesting BigNum Stories (Via Slashdot) Message #3 Posted by Xavier A. (Brazil) on 6 Jan 2010, 2:45 p.m., in response to message #1 by Les Bell Quote: Pi to 2.7 Trillion (Approx) Decimal Digits And the winner is... LINUX ! (OS speaking, of course it is also an excellent human performance) Very good news, thank you.

OT: Two Interesting BigNum Stories (Via Slashdot) Message #4 Posted by DavidShenk on 7 Jan 2010, 12:28 a.m., in response to message #1 by Les Bell There are quite a few songs written about pi, here is a favorite. Getting more OT, musician John Boswell's Symphony of Science uses Auto-Tune software to create songs from the spoken words of Carl Sagan, Stephen Hawking and others. With the idea of promoting science, all songs are free to download. Dave

Re: Two Interesting BigNum Stories (Via Slashdot) Message #5 Posted by cyrille de Brébisson on 7 Jan 2010, 9:10 a.m., in response to message #1 by Les Bell darn it, you guys saw that... I obviously did not know about the prior art when I filed the application... what is the stangest is that the thing got accepted! one of the PB is that HP is telling us NOT to look for prior art and NOT to look in publications to see other's inventions/idea. the reason for this is that in court, when comes time to defend a patent, if the other party can show that you had knowledge of their stuff, it can be damaging to you.... anyhow, I have now made /. twice, once for good (developer friendly 20b) and once for bad (stupid patent)... cyrille

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