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1
Vaughan Pratt
Vaughan Pratt's talk at The Constructive in Logic and Applications 2012
::2012/08/02::
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2
Diving, Boracay Island Philippines
Diving, Boracay Island Philippines
::2013/08/12::
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3
In Conversation: Mary Pratt and Mireille Eagan - January 18 2014
In Conversation: Mary Pratt and Mireille Eagan - January 18 2014
::2014/01/24::
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4
Rebecca Vaughan - Villains (KTV Studio Sessions)
Rebecca Vaughan - Villains (KTV Studio Sessions)
::2014/06/06::
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5
3 Licks de Blues en Guitarra  Electrica -  Steve Ray Vaughan
3 Licks de Blues en Guitarra Electrica - Steve Ray Vaughan
::2013/08/23::
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6
Trailer: Brazil
Trailer: Brazil
::2012/08/01::
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7
Delivery Man Official Teaser Trailer #1 (2013) - Vince Vaughn, Chris Pratt  Movie HD
Delivery Man Official Teaser Trailer #1 (2013) - Vince Vaughn, Chris Pratt Movie HD
::2013/05/22::
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8
Stevie Ray Vaughan..Hardly
Stevie Ray Vaughan..Hardly
::2011/10/05::
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9
Juke Joint Festival - Kern Pratt, David Hyde, Denise Owen, Luc Borms - Clarksdale, MS
Juke Joint Festival - Kern Pratt, David Hyde, Denise Owen, Luc Borms - Clarksdale, MS
::2014/05/04::
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10
Kern pratt jamming !!
Kern pratt jamming !!
::2014/07/08::
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11
SCM Performance - Daryl Pratt Sextet "Bell"
SCM Performance - Daryl Pratt Sextet "Bell"
::2013/09/04::
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12
CIBC Run For The Cure Woodbridge/Vaughan 2013 Recap Video
CIBC Run For The Cure Woodbridge/Vaughan 2013 Recap Video
::2014/08/19::
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13
Andy Pratt - Wet Daddy
Andy Pratt - Wet Daddy
::2011/02/26::
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14
76 Forest Heights Blvd, Vaughan L0J1C0, Ontario - Virtual Tour
76 Forest Heights Blvd, Vaughan L0J1C0, Ontario - Virtual Tour
::2014/07/05::
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15
Knuth-Morris-Pratt-Suchalgorithmus: Implementierung in C
Knuth-Morris-Pratt-Suchalgorithmus: Implementierung in C
::2012/05/17::
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16
Brian Sances Band ~ Tightrope (Stevie Ray Vaughan)
Brian Sances Band ~ Tightrope (Stevie Ray Vaughan)
::2014/08/04::
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17
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
Pen and Ink - Dr Vaughan Rees - Drawing Essentials
::2013/12/18::
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18
SCM Performance - Daryl Pratt Sextet "1st Intersection"
SCM Performance - Daryl Pratt Sextet "1st Intersection"
::2013/09/04::
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19
Vaughan business round table with Minister Fantino and Sorenson
Vaughan business round table with Minister Fantino and Sorenson
::2014/07/29::
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20
Nine-year old Pratt: No more Asthma!
Nine-year old Pratt: No more Asthma!
::2014/02/15::
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21
Be Good To Her - The Andy Pratt Trio
Be Good To Her - The Andy Pratt Trio
::2014/07/03::
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22
86 Giancola Crescent, Vaughan L6A 2T5, Ontario - Virtual Tour
86 Giancola Crescent, Vaughan L6A 2T5, Ontario - Virtual Tour
::2014/08/01::
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23
415 Athabasca Dr., Vaughan L6A 3S2, Ontario - Virtual Tour
415 Athabasca Dr., Vaughan L6A 3S2, Ontario - Virtual Tour
::2014/07/16::
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24
Jazz in the Cafe - Daryl Pratt "Pitch Black"
Jazz in the Cafe - Daryl Pratt "Pitch Black"
::2013/10/22::
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25
Stevie Ray Vaughan - Tin Pan Alley (Pt 2)
Stevie Ray Vaughan - Tin Pan Alley (Pt 2)
::2007/06/25::
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26
We Won
We Won't Let Up on Project Gunrunner! Larry Pratt on Lou Dobbs
::2011/06/24::
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27
Land Connections - Collaboration with Connect Special Needs Program - City of Vaughan
Land Connections - Collaboration with Connect Special Needs Program - City of Vaughan
::2013/06/07::
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28
Delivery Man Trailer HD Vince Vaughan Official Trailer #1 (2013)
Delivery Man Trailer HD Vince Vaughan Official Trailer #1 (2013)
::2013/10/31::
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29
Victoria Pratt
Victoria Pratt
::2011/04/04::
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30
The Punter Pratted
The Punter Pratted
::2006/08/06::
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31
"Lynn Pratt & his Rhythm Cats-They
"Lynn Pratt & his Rhythm Cats-They're learning",
::2014/04/30::
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32
Car Dashcam - Kitchener 15 (& Vaughan)
Car Dashcam - Kitchener 15 (& Vaughan)
::2013/09/29::
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33
RANDY PRATT JOINS THE VINTAGE REVOLUTION BAND FOR SOME "TUSH"
RANDY PRATT JOINS THE VINTAGE REVOLUTION BAND FOR SOME "TUSH"
::2013/01/06::
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34
SCM Performance - Daryl Pratt Sextet (2010)
SCM Performance - Daryl Pratt Sextet (2010)
::2011/02/15::
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35
21 Card Lumber Cres, Vaughan, ON
21 Card Lumber Cres, Vaughan, ON
::2014/08/16::
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36
First Actually Snow In Canada, Ontario (Vaughan)
First Actually Snow In Canada, Ontario (Vaughan)
::2012/12/22::
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37
$1,340,000 - 9680 Keele St., Vaughan, ON L6A3Y6
$1,340,000 - 9680 Keele St., Vaughan, ON L6A3Y6
::2014/08/15::
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38
What Kind Of Fool Am I (Karl Pratt)
What Kind Of Fool Am I (Karl Pratt)
::2011/10/18::
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39
Taste
Taste
::2012/01/07::
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40
8 Clover Leaf Street Vaughan ON L4L5M2 - Peter Lam - Tradeworld Realty Inc, Brokerage
8 Clover Leaf Street Vaughan ON L4L5M2 - Peter Lam - Tradeworld Realty Inc, Brokerage
::2014/04/23::
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41
Blues After Dark - Keesha Pratt Draft Part 1
Blues After Dark - Keesha Pratt Draft Part 1
::2011/11/06::
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42
Jerry Pratt, Videographer:  Part 3 of 3: The Weather Channel
Jerry Pratt, Videographer: Part 3 of 3: The Weather Channel's "Storm Stories" (2005)
::2009/08/24::
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43
Tim Pratt ISSMA Solo 2011
Tim Pratt ISSMA Solo 2011
::2011/05/07::
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44
47-489 Aialii Street Kaneohe, HI 96744  Presented by Barbara H Pratt
47-489 Aialii Street Kaneohe, HI 96744 Presented by Barbara H Pratt
::2014/04/25::
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45
Greg and Ray Pratt Meremere
Greg and Ray Pratt Meremere
::2011/11/13::
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46
2724 Ashehollow Lane Edmond OK 73034 - Paula Vaughan - Metro First Realty - Obeo Virtual Tour 778366
2724 Ashehollow Lane Edmond OK 73034 - Paula Vaughan - Metro First Realty - Obeo Virtual Tour 778366
::2013/04/06::
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47
Dan Pratt - Founder Kindermusik PART I
Dan Pratt - Founder Kindermusik PART I
::2009/06/01::
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48
Roger Vaughan Counterpiece for Tuba
Roger Vaughan Counterpiece for Tuba
::2010/06/09::
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49
Stevenson defensive back Eugene Pratt just misses a pick six vs. Eisenhower
Stevenson defensive back Eugene Pratt just misses a pick six vs. Eisenhower
::2010/09/03::
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50
Concordia Choir: Lord, Thou Hast Been Our Refuge
Concordia Choir: Lord, Thou Hast Been Our Refuge
::2012/01/13::
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From Wikipedia, the free encyclopedia
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Vaughan Pratt

Vaughan Ronald Pratt (born 1944), a Professor Emeritus at Stanford University, was an early pioneer in the field of computer science. Publishing 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 with the Association for Computing Machinery and is on the Editorial Board of three major mathematics journals. He is also the Chairman and CTO of TIQIT Computers, Inc..

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". Journal of Computer and System Sciences 7 (4): 448–461. doi:10.1016/S0022-0000(73)80033-9.  edit
  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)"". comp.sys.intel. Web link. Retrieved 2006-06-03.

External links[edit]

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