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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
17 Famous Logos With HIDDEN MEANINGS!
17 Famous Logos With HIDDEN MEANINGS!
Published: 2017/06/16
Channel: Factnomenal
Diving, Boracay Island Philippines
Diving, Boracay Island Philippines
Published: 2013/08/12
Channel: setecastronomyinc
Vince Vaughn Freaked After Learning Colin Farrell Was a Murder Suspect
Vince Vaughn Freaked After Learning Colin Farrell Was a Murder Suspect
Published: 2015/06/20
Channel: The Tonight Show Starring Jimmy Fallon
GOA
GOA's Larry Pratt on Fox and Friends
Published: 2015/06/02
Channel: Gun Owners of America
Fall Spotlight 2013
Fall Spotlight 2013
Published: 2013/11/05
Channel: BK Spotlight
Stevie Ray Vaughan..Hardly
Stevie Ray Vaughan..Hardly
Published: 2011/10/06
Channel: Tyler Pratt
22 Hidden Messages In Famous Logos (Part 1)
22 Hidden Messages In Famous Logos (Part 1)
Published: 2016/01/24
Channel: SC Videos
Norman Kaye, Legacy Awardee Died on Sept. 17th, 2012
Norman Kaye, Legacy Awardee Died on Sept. 17th, 2012
Published: 2012/10/01
Channel: Johnny Kai
Stevie Ray Vaughan & Bonnie Rait - Bumbershoot Festival 1985 [BOOTLEG]
Stevie Ray Vaughan & Bonnie Rait - Bumbershoot Festival 1985 [BOOTLEG]
Published: 2014/04/10
Channel: SRV Bootlegs
True Confessions with Colin Farrell and Vince Vaughn
True Confessions with Colin Farrell and Vince Vaughn
Published: 2015/06/19
Channel: The Tonight Show Starring Jimmy Fallon
Closer Look: Passengers
Closer Look: Passengers
Published: 2016/12/20
Channel: Celebrity Page TV Network
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
Published: 2013/12/18
Channel: Art & Design Resources
Innisfil Home Deal at 1525 Rankin Way, L9S 0C6
Innisfil Home Deal at 1525 Rankin Way, L9S 0C6
Published: 2016/08/12
Channel: Lino Arci
Delivery Man Review (2013)
Delivery Man Review (2013)
Published: 2013/11/22
Channel: Adriana Floridia
how easy to make LOGO SUN Microsystem (AMBIGRAM)
how easy to make LOGO SUN Microsystem (AMBIGRAM)
Published: 2017/03/04
Channel: MAX Design
The Vagabond (Karl Pratt)
The Vagabond (Karl Pratt)
Published: 2015/06/21
Channel: Karl Pratt
Stevie Ray Vaughan & Bonnie Raitt - Texas Flood - Live Seattle 1985
Stevie Ray Vaughan & Bonnie Raitt - Texas Flood - Live Seattle 1985
Published: 2016/01/02
Channel: SRV Bootlegs
At bubble soccer overview- Vaughan Ontario Canada
At bubble soccer overview- Vaughan Ontario Canada
Published: 2015/12/17
Channel: REVIEWS
Topos
Topos
Published: 2016/01/22
Channel: WikiAudio
Delivery Man Trailer 2013 Vince Vaughn Official Movie Trailer #2 [HD]
Delivery Man Trailer 2013 Vince Vaughn Official Movie Trailer #2 [HD]
Published: 2013/07/04
Channel: Cieon Movies
My Little Hula Girl
My Little Hula Girl
Published: 2013/02/19
Channel: James Muir
Taste
Taste
Published: 2012/01/08
Channel: Theo Sturz
Stable Carol
Stable Carol
Published: 2015/12/09
Channel: SB Music Society
Flash Gordon Classic
Flash Gordon Classic
Published: 2015/05/11
Channel: robbpratt - Where 2d Animation is NOT Dead!
Douglas Crockford - Syntaxation ( MLOC JS )
Douglas Crockford - Syntaxation ( MLOC JS )
Published: 2013/06/03
Channel: menelaus35
Learn More About Pratt Institute
Learn More About Pratt Institute's Fashion Design Program
Published: 2017/06/01
Channel: PRATT INSTITUTE
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
Johnny Copeland - When the Rain Starts Falling
Johnny Copeland - When the Rain Starts Falling
Published: 2017/06/25
Channel: Sliptrail
The Dinosaur Experiment | Full Movie
The Dinosaur Experiment | Full Movie
Published: 2016/11/12
Channel: Kings of Horror
ANDRE PREVIN - This Can
ANDRE PREVIN - This Can't Be Love (1947)
Published: 2013/07/19
Channel: ramoburg
How To Make Any Windows Full Screen Resolution in Oracle VM VirtualBox
How To Make Any Windows Full Screen Resolution in Oracle VM VirtualBox
Published: 2017/03/25
Channel: Mr.Helper
Parade at Wagah Border (The true feeling for the Nation comes from here )
Parade at Wagah Border (The true feeling for the Nation comes from here )
Published: 2013/05/02
Channel: Neeraj Pareta
How To Install Windows In Virtualbox
How To Install Windows In Virtualbox
Published: 2017/03/21
Channel: Mr.Helper
Woking 0-0 Hereford United - 4th January 1992
Woking 0-0 Hereford United - 4th January 1992
Published: 2017/05/20
Channel: Matt Healey
Mark Alburger - Job: A Masque - X. "Who Are You"
Mark Alburger - Job: A Masque - X. "Who Are You"
Published: 2010/10/09
Channel: DrMarkAlburger
Mad Lib Theater with Benedict Cumberbatch
Mad Lib Theater with Benedict Cumberbatch
Published: 2016/11/04
Channel: The Tonight Show Starring Jimmy Fallon
Johnny Copeland - Old Man Blues.wmv
Johnny Copeland - Old Man Blues.wmv
Published: 2012/02/20
Channel: sanny blues
Johnny Copeland - St. Louis Blues.wmv
Johnny Copeland - St. Louis Blues.wmv
Published: 2012/03/27
Channel: sanny blues
Delivery Man Movie CLIP - Thanks Kids (2013) - Vince Vaughn Comedy HD
Delivery Man Movie CLIP - Thanks Kids (2013) - Vince Vaughn Comedy HD
Published: 2013/11/26
Channel: Movieclips Coming Soon
Trailer: Brazil
Trailer: Brazil
Published: 2012/08/01
Channel: Choapa Cine
ANDRE PREVIN   - But Not For Me (1948)
ANDRE PREVIN - But Not For Me (1948)
Published: 2016/07/10
Channel: ramoburg
The Little Drummer Boy
The Little Drummer Boy
Published: 2015/12/10
Channel: SB Music Society
How to Mount an .ISO Image Files into VirtualBox (VBoxGuestAdditions.iso)
How to Mount an .ISO Image Files into VirtualBox (VBoxGuestAdditions.iso)
Published: 2017/03/29
Channel: Mr.Helper
Top 10 Memorable Prom Dresses In Movies And TV
Top 10 Memorable Prom Dresses In Movies And TV
Published: 2017/05/13
Channel: MsMojo
Ricky Gervais Pits His Mild British Palate Against Spicy Wings | Hot Ones
Ricky Gervais Pits His Mild British Palate Against Spicy Wings | Hot Ones
Published: 2017/02/09
Channel: First We Feast
Close Encounter - SNL
Close Encounter - SNL
Published: 2015/12/06
Channel: Saturday Night Live
Joe Quesada and Idlechatter
Joe Quesada and Idlechatter's MARVEL CHRISTMAS SONGS 2002-2006
Published: 2016/11/30
Channel: MattHawes
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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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