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David H. Bailey
"Computo ergo sum."
Senior Scientist, Computational Research Dept.
Lawrence Berkeley National Laboratory
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News
- 11 Apr 2012: Bailey's book Exploratory Experimentation in Mathematics: Selected Works is out -- see in "Books" below.
- 2 Apr 2012: Bailey's first article in the Huffington Post
has appeared -- see in "Huffington Post" below.
- 23 Aug 2011: Bailey's first article in the Conversation
has appeared -- see in "Conversation articles" below.
- 28 Apr 2011: Bailey was mentioned
on the
Dept. of Energy website about pi-squared computation.
- 20 Dec 2010: Bailey's book Performance Tuning of Scientific Applications is out -- see in "Books" below.
- 12 Mar 2010: Bailey was quoted in CNN article about Pi Day:
Online article. For other information on Pi, see
Pi directory.
Blog
The new "Math Drudge" blog is now online. It contains essays, philosophical musings, interesting quotes and exercises, all in the realm of mathematics, computing and scientific research:
Blog
DISCLAIMER: This site is owned by Bailey and operated by Bailey and his colleague Jonathan Borwein of the University of Newcastle, Australia. Neither LBNL, the University of California or the U.S. Department of Energy endorses this material.
Books
Bailey has written one book on performance science, four books on computational and experimental mathematics, a CD-ROM reference. All of these books are available at Amazon.com or directly from the respective publishers. Further information on the experimental math books is available in the Books section of the experimental math website (see disclaimer above):
http://www.experimentalmath.info/books
Conversation articles
Bailey and his colleague Jonathan Borwein have authored articles for The Conversation, an international forum of academic research and discussion based in Melbourne, Australia. A listing of these articles is available here:
Conversation articles.
Experimental Mathematics
Bailey has published numerous research studies in the area of "experimental" (computer-assisted) mathematics, which establish that modern high-performance computer technology can be effectively utilized as a tool for mathematical research. Here is a website with additional information:
DISCLAIMER: This site is owned by Bailey and operated by Bailey and his colleague Jonathan Borwein of the University of Newcastle, Australia. Neither LBNL, the University of California or the U.S. Department of Energy endorses this material.
High-Precision Software Library
Bailey is a co-author of several software libraries for high-precision computation. These libraries include translation facilities so that one can use, with minor modifications, ordinary Fortran or C++ programs to perform high-precision calculations:
http://crd-legacy.lbl.gov/~dhbailey/mpdist.
Huffington Post articles
Bailey and his colleague Jonathan Borwein have authored articles for the Huffington Post, a popular news and information based in the U.S. that was recently named the world's most influential blog/news site in a U.K. Guardian article. A listing of these articles is available here: Huffington Post articles.
Online Papers
Online copies of over 150 of Bailey's technical papers are available here:
http://crd-legacy.lbl.gov/~dhbailey/dhbpapers
Online Talks
Online copies of many of Bailey's recent lectures are available here:
http://crd-legacy.lbl.gov/~dhbailey/dhbtalks
Personal Websites
Some papers, photos and other materials not related to Bailey's official duties at LBNL are available at these websites:
DISCLAIMER: These two sites are owned and operated by Bailey. Neither LBNL, the University of California or the U.S. Department of Energy supports or endorses this material.
Photos
- Photo of Bailey with an LBNL shuttle bus displaying pi poster:
Shuttle bus
- Photo of an auto previously owned by Bailey, together with several researchers involved in calculations of pi (Yasumasa Kanada, Eugene Salamin and William Gosper):
Auto photo
- Photo of the view from a spot at LBNL to downtown San Francisco:
View from LBNL
- Personal photo of Bailey (12 Kbyte):
Bailey photo -- 12 Kbyte
- Personal photo of Bailey (1 Mbyte):
Bailey photo -- 1 Mbyte
- Bailey near summit of Half Dome:
Bailey at Half Dome.
This photo (taken by Derek Schickor) is now featured on the Google website when one types "Half Dome" (without the quotation marks) in the Google search window
http://images.google.com.
Pi
In 1996, Peter Borwein (brother of Jonathan Borwein), Simon Plouffe and Bailey co-authored a paper that presents a new formula for pi:
This formula, now known as the "BBP formula for pi", permits one to compute the n-th binary or hexadecimal digit of pi, without computing the first n-1 digits, by means of a simple scheme that requires very little memory. It was discovered by Simon Plouffe using a computer program written by Bailey that implements a simplified version of Helaman Ferguson's "PSLQ" algorithm. More recently, Richard Crandall and Bailey have shown that there is a connection between the new pi formula and the centuries-old question of normality (ie, statistical randomness of digits in a certain sense) of pi and various other math constants. This work has been featured in recent Science News and Scientific American articles:
- Bailey's pi website:
http://crd-legacy.lbl.gov/~dhbailey/pi
- Science News article (April 24, 2004):
PDF (5 Mbyte)
- Scientific American article (May 2003):
PDF
- See if your name is coded in the first four billion binary digits of pi:
http://pisearch.lbl.gov
- Search for a hex string in the first four billion binary digits of pi:
http://pisearch.lbl.gov
- Fax to Bailey from "The Simpsons" TV show:
PDF.
Note: The 40,000th digit of pi was provided to the show by Bailey, and this was aired in the show on 6 May 1993 -- search for "Marge in Chains" on the page
HTML.
Resume
Bailey's detailed curriculum vitae (resume), including a list of publications, is
available here:
PDF.
Sustained Performance, Energy and Resilience (SUPER) Institute
Bailey is the assistant leader of a multi-institution, DOE-funded research program encompassing high-end performance optimization, automatic performance tuning, energy-efficient computing and resilient computing. Software, papers, talks and other material are available here:
http://www.super-scidac.org
Websites of Interest
- Jonathan Borwein -- many interesting links on general mathematics and experimental mathematics:
Jonathan Borwein.
- Peter Borwein -- lots of information on pi and number theory:
Peter Borwein
- Richard Crandall -- many useful tools for computational number theory:
Richard Crandall
- James Demmel -- lots of information on computational linear algebra and computer science:
James Demmel
- Helaman Ferguson -- numerous photos of his beautiful mathematical sculptures:
Helaman Ferguson
