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International House Alumni Interview: Prof. Vaughan Pratt
International House Alumni Interview: Prof. Vaughan Pratt
Published: 2015/09/02
Channel: International House, The University of Sydney
Vaughan Pratt
Vaughan Pratt's talk at The Constructive in Logic and Applications 2012
Published: 2012/08/02
Channel: Yegor Bryukhov
Donald Knuth - The Knuth-Morris-Pratt algorithm (92/97)
Donald Knuth - The Knuth-Morris-Pratt algorithm (92/97)
Published: 2016/01/12
Channel: Web of Stories - Life Stories of Remarkable People
BEL CANTO Récital - Jessica Pratt / Parma (31 Octobre 2015)
BEL CANTO Récital - Jessica Pratt / Parma (31 Octobre 2015)
Published: 2017/03/04
Channel: Lyric'OperaFan Roca
Diving, Boracay Island Philippines
Diving, Boracay Island Philippines
Published: 2013/08/12
Channel: setecastronomyinc
17 Famous Logos With HIDDEN MEANINGS!
17 Famous Logos With HIDDEN MEANINGS!
Published: 2017/06/16
Channel: Factnomenal
Kern Pratt - Lights Are On, But Nobody
Kern Pratt - Lights Are On, But Nobody's Home
Published: 2015/07/14
Channel: thepowerofblues
Chris Pratt with Best Supporting Actor......a Bacon Sandwich
Chris Pratt with Best Supporting Actor......a Bacon Sandwich
Published: 2017/04/24
Channel: BBC Radio 1
Five Stages of Accepting Constructive Mathematics
Five Stages of Accepting Constructive Mathematics
Published: 2014/03/12
Channel: tactics40
Jessica Vaughn on immigrant rights
Jessica Vaughn on immigrant rights
Published: 2015/06/02
Channel: CGTN America
Rogers TV Vaughan - Local Notes
Rogers TV Vaughan - Local Notes
Published: 2011/03/28
Channel: FFBCanada
Ivy Social Club, Vaughan ON (2015) - Video 1
Ivy Social Club, Vaughan ON (2015) - Video 1
Published: 2016/07/10
Channel: Joe Sanfilippo
Learn More About Pratt Institute
Learn More About Pratt Institute's Fashion Design Program
Published: 2017/06/01
Channel: PRATT INSTITUTE
Stevie Ray Vaughan..Hardly
Stevie Ray Vaughan..Hardly
Published: 2011/10/06
Channel: Tyler Pratt
Ivy Social Club - Vaughan ON (2015) - Video 2
Ivy Social Club - Vaughan ON (2015) - Video 2
Published: 2016/07/10
Channel: Joe Sanfilippo
GOA
GOA's Larry Pratt on Fox and Friends
Published: 2015/06/02
Channel: Gun Owners of America
22 Hidden Messages In Famous Logos (Part 1)
22 Hidden Messages In Famous Logos (Part 1)
Published: 2016/01/24
Channel: SC Videos
Pizza with Vaughan - Episode 7 (3/20/14)
Pizza with Vaughan - Episode 7 (3/20/14)
Published: 2014/03/25
Channel: BTV6
how easy to make LOGO SUN Microsystem (AMBIGRAM)
how easy to make LOGO SUN Microsystem (AMBIGRAM)
Published: 2017/03/04
Channel: MAX Design
International House Alumni Interview: Mrs Margot Koster Pratt
International House Alumni Interview: Mrs Margot Koster Pratt
Published: 2015/09/02
Channel: International House, The University of Sydney
Vaughan Rowsell (Vend) - Auckland Startup & Tech Meetup 2014
Vaughan Rowsell (Vend) - Auckland Startup & Tech Meetup 2014
Published: 2015/01/13
Channel: Edmund Hillary Fellowship
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
Published: 2013/12/18
Channel: Art & Design Resources
Jane & King Mountain Bike Trail
Jane & King Mountain Bike Trail
Published: 2015/07/12
Channel: Rob Belv
At bubble soccer overview- Vaughan Ontario Canada
At bubble soccer overview- Vaughan Ontario Canada
Published: 2015/12/17
Channel: REVIEWS
Glama Gal Vaughan
Glama Gal Vaughan
Published: 2015/02/04
Channel: Glama Gal Tween Spa
A Night with Tiffany Pratt and the Glama Gals
A Night with Tiffany Pratt and the Glama Gals
Published: 2015/10/02
Channel: Glama Gal Tween Spa
Princeton University Orchestra Budapest 2007 Michael Pratt
Princeton University Orchestra Budapest 2007 Michael Pratt
Published: 2007/02/27
Channel: regnumschool
Mayor Nancy Vaughan celebrates season finale of NBC
Mayor Nancy Vaughan celebrates season finale of NBC's Parks and Recreation
Published: 2015/02/25
Channel: Amanda Lehmert
Topos
Topos
Published: 2016/01/22
Channel: WikiAudio
Stevenson RB Vanesse Vaughan 11 yard run vs. Utica Ford
Stevenson RB Vanesse Vaughan 11 yard run vs. Utica Ford
Published: 2010/10/03
Channel: R McElhaney
Johnny Copeland - St. Louis Blues.wmv
Johnny Copeland - St. Louis Blues.wmv
Published: 2012/03/27
Channel: sanny blues
The Gondoliers (Act 1) (1991) - New D
The Gondoliers (Act 1) (1991) - New D'Oyly Carte - G&S
Published: 2013/12/27
Channel: UnclaimedFr8
When Jesus Came to Jordan (Fred Pratt Green)
When Jesus Came to Jordan (Fred Pratt Green)
Published: 2015/09/09
Channel: HymnTime
Taste
Taste
Published: 2012/01/08
Channel: Theo Sturz
Trinity Grammar School Symphony Orchestra
Trinity Grammar School Symphony Orchestra
Published: 2016/06/11
Channel: Emale1502
David Vaughan College Basketball Game 1 Highlights
David Vaughan College Basketball Game 1 Highlights
Published: 2009/11/28
Channel: davidv1010
Double Shot Interview: John Bolton, Squirrel Mortgages with Gareth Vaughan
Double Shot Interview: John Bolton, Squirrel Mortgages with Gareth Vaughan
Published: 2012/11/29
Channel: ofInterestNZ
Ricky Ponting 2005 Ashes Run Out
Ricky Ponting 2005 Ashes Run Out
Published: 2007/04/28
Channel: Spocq
Luisa Omielan plays Innuendo Bingo
Luisa Omielan plays Innuendo Bingo
Published: 2017/04/28
Channel: BBC Radio 1
Stevenson RB Vanesse Vaughan gains eight yards on run vs. Utica Ford
Stevenson RB Vanesse Vaughan gains eight yards on run vs. Utica Ford
Published: 2010/10/03
Channel: R McElhaney
Policing York Region: Recruiting & Crime Prevention
Policing York Region: Recruiting & Crime Prevention
Published: 2017/02/02
Channel: Rogers tv
Dan Pratt - Founder Kindermusik PART I
Dan Pratt - Founder Kindermusik PART I
Published: 2009/06/01
Channel: Jessica Vecchione
Unfinished Business Official Trailer #1 (2015) - Vince Vaughn, Dave Franco Movie HD
Unfinished Business Official Trailer #1 (2015) - Vince Vaughn, Dave Franco Movie HD
Published: 2014/11/28
Channel: Movieclips Trailers
Stevenson RB VaNess Vaughan picks up five yards vs. Eisenhower
Stevenson RB VaNess Vaughan picks up five yards vs. Eisenhower
Published: 2010/09/04
Channel: R McElhaney
FLAT EARTH BRITISH Filtered ANTARCTIC SURVEY INTERVIEW WITH PROF  DAVID VAUGHAN  ANY COMMENT  WATCH!
FLAT EARTH BRITISH Filtered ANTARCTIC SURVEY INTERVIEW WITH PROF DAVID VAUGHAN ANY COMMENT WATCH!
Published: 2017/04/20
Channel: FLAT EARTH BRITISH Filtered,
Orlando Bloom talks paddle boarding and dogs with Nick Grimshaw
Orlando Bloom talks paddle boarding and dogs with Nick Grimshaw
Published: 2017/04/26
Channel: BBC Radio 1
Jeff Vaughan
Jeff Vaughan's first engine start!
Published: 2008/08/04
Channel: lucky macy
My Little Hula Girl
My Little Hula Girl
Published: 2013/02/19
Channel: James Muir
THE WATCH (Ben Stiller, Vince Vaughan, Jonah Hill) - moview review / commentary / reactions!
THE WATCH (Ben Stiller, Vince Vaughan, Jonah Hill) - moview review / commentary / reactions!
Published: 2012/07/29
Channel: ThatHappyCouple
Craig Ripley, Audley Vaughan, JR  at Glen Cove Golf Course 6/614  9:15am
Craig Ripley, Audley Vaughan, JR at Glen Cove Golf Course 6/614 9:15am
Published: 2014/06/06
Channel: coltsvideo
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Vaughan Pratt
VaughanPratt.JPG
Born Vaughan Ronald Pratt
(1944-04-12) April 12, 1944 (age 73)
Melbourne, Australia
Fields Computer science
Institutions Stanford University
MIT
Alma mater Stanford University (1972)
University of Sydney (1970)
Academic advisors Donald Knuth
Known for Knuth–Morris–Pratt algorithm
Pratt certificate
Pratt parser
Website
boole.stanford.edu/pratt.html

Vaughan Pratt (born on April 12, 1944) is a Professor Emeritus at Stanford University, who was an early pioneer in the field of computer science. Since 1969, Pratt has made several contributions to foundational areas such as search algorithms, sorting algorithms, and primality testing. More recently, his research has focused on formal modeling of concurrent systems and Chu spaces. A pattern of applying models from diverse areas of mathematics such as geometry, linear algebra, abstract algebra, and especially mathematical logic to computer science pervades his work.

Career[edit]

Raised in Australia and educated at Knox Grammar School where he was dux in 1961, Pratt attended Sydney University where he completed his masters thesis in 1970, related to what is now known as natural language processing. He then went to the United States, where he completed a Ph.D. thesis at Stanford University in only 20 months under the supervision of advisor Donald Knuth. His thesis focused on analysis of the shellsort sorting algorithm and sorting networks.

Pratt was an Assistant Professor at MIT (1972 to 1976) and then Associate Professor (1976 to 1982). In 1974, working in collaboration with Knuth and Morris, Pratt completed and formalized work he had begun in 1970 as a graduate student at Berkeley; the coauthored result was the Knuth-Morris-Pratt pattern matching algorithm. In 1976, he developed the system of dynamic logic, a modal logic of structured behavior.

He went on sabbatical from MIT to Stanford (1980 to 1981), and was appointed a full professor at Stanford in 1981.

Pratt directed the SUN workstation project at Stanford from 1980 to 1982. He contributed in various ways to the founding and early operation of Sun Microsystems, acting in the role of consultant for its first year, then, taking a leave of absence from Stanford for the next two years, becoming Director of Research, and finally resuming his role as a consultant to Sun and returning to Stanford in 1985.

He also designed the Sun logo, which features four interleaved copies of the word "sun"; it is an ambigram.

Pratt became professor emeritus at Stanford in 2000.

Major contributions[edit]

A number of well-known algorithms bear Pratt's name. Pratt certificates, short proofs of the primality of a number, demonstrated in a practical way that primality can be efficiently verified, placing the primality testing problem in the complexity class NP and providing the first strong evidence that the problem is not co-NP-complete.[1] The Knuth-Morris-Pratt algorithm, which Pratt designed in the early 1970s together with fellow Stanford professor Donald Knuth and independently from Morris, is still the most efficient general string searching algorithm known today.[2] Along with Blum, Floyd, Rivest, and Tarjan, he described median of medians, the first worst-case optimal selection algorithm.[3]

Useful tool building[edit]

Pratt built some useful tools. In 1976, he wrote an MIT AI Lab working paper about CGOL, an alternative syntax for MACLISP that he had designed and implemented based on his paradigm for top down operator precedence parsing.[4] His parser is sometimes called a "Pratt parser"[5] and has been used in later systems, such as MACSYMA. Douglas Crockford also used it as the underlying parser for JSLint.[6] Pratt also implemented a TECO-based text editor named "DOC", which was later renamed to "ZED".[7]

In 1999, Pratt built the world's smallest (at the time) web server—it was the size of a matchbox.[8][9]

Other contributions[edit]

Pratt was credited in a 1995 Byte magazine article for proposing that the Pentium FDIV bug might have worse consequences than either Intel or IBM was predicting at the time.[10][11]

Today Pratt has a wide influence. In addition to his Stanford professorship, he holds membership in at least seven professional organizations. He is a fellow of the Association for Computing Machinery and is on the Editorial Board of three major mathematics journals. He was also the Founder, Chairman, and CTO of TIQIT Computers, Inc. for the ten years prior to when it closed its doors in 2010.

References[edit]

  1. ^ Vaughan Pratt. Every prime has a succinct certificate. SIAM Journal on Computing, vol.4, pp.214–220. 1975. Citations, Full-text (requires paid login)
  2. ^ Donald Knuth, James H. Morris, Jr., and Vaughan Pratt. Fast pattern matching in strings. SIAM Journal on Computing, 6(2):323–350. 1977. Citations
  3. ^ Blum, M.; Floyd, R. W.; Pratt, V. R.; Rivest, R. L.; Tarjan, R. E. (August 1973). "Time bounds for selection" (PDF). Journal of Computer and System Sciences. 7 (4): 448–461. doi:10.1016/S0022-0000(73)80033-9. 
  4. ^ Pratt, V.R., Top Down Operator Precedence. Proceedings of the ACM Symposium on Principles of Programming Languages. 1973. pp41-51.
  5. ^ George J. Carrette A simple Pratt-Parser for SIOD. 1990.
  6. ^ https://github.com/douglascrockford/JSLint/blob/40e3f73127b56f24a12e5cb091a86d9a24130926/fulljslint.js jslint source code line 2224
  7. ^ Eric Fischer. Emacs and Other Editors. alt.folklore.computers. November 15, 2000.
  8. ^ BBC News.Surfing on a matchbox. 1999.
  9. ^ CNN News. Smallest Web server fits in shirt pocket. 1999.
  10. ^ "How to Bruise an Integer", Byte, March 1995.
  11. ^ "Chain Reaction in Pentiums", Vaughan Pratt, 1994. In wdv-notes334, 22 Jan, 1995. Article is formatted from a newsgroup posting: Vaughan Pratt (1994-12-30). ""TECHNICAL: Chain reaction in Pentiums (Was: The Flaw: Pentium-Contaminated Data Persists)"". Newsgroupcomp.sys.intel. Usenet: 3e097i$952@Radon.Stanford.EDU. Retrieved 2006-06-03. 

External links[edit]

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