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Donald Knuth

Data de nascimento: 10. Janeiro 1938

Donald Ervin Knuth é um cientista computacional de renome e professor emérito da Universidade de Stanford. É o autor do livro The Art of Computer Programming, uma das principais referências da ciência da computação. Ele praticamente criou o campo de análise de algoritmos e fez muitas das principais contribuições a vários ramos da teoria da computação. Ele também criou o sistema tipográfico TEX, o sistema de criação de fontes METAFONT, além de ser pioneiro do conceito de programação literária. Finalmente, desenvolveu o conceito de número surreal.

Citações Donald Knuth

„A ciência é o que nós compreendemos suficientemente bem para explicar a um computador. A arte é tudo mais.“

—  Donald Knuth
Science is what we understand well enough to explain to a computer. Art is everything else we do. Mathematical reviews‎ - Vol. 42, Página 5969, de American Mathematical Society, Mathematical Association of America - 1997

„Na verdade, minha conclusão principal após gastar dez anos de minha vida trabalhando no projeto TEX é que software é difícil. É mais difícil do que qualquer coisa que já tenha feito.“

—  Donald Knuth
In fact, my main conclusion after spending ten years of my life working on the T<sub>E</sub>X project is that software is hard. It’s harder than anything else I’ve ever had to do. [en, http://www.ams.org/notices/200203/fea-knuth.pdf, All Questions Answered, Notices of the AMS, 49, 3, 320]

„Random numbers should not be generated with a method chosen at random“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. II, Seminumerical Algorithms

„Science is what we understand well enough to explain to a computer. Art is everything else we do.“

—  Donald Ervin Knuth, Things a Computer Scientist Rarely Talks About
Foreword to the book A=B http://www.cis.upenn.edu/~wilf/AeqB.html (1996)

„An algorithm must be seen to be believed.“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. I, Fundamental Algorithms, Section 1.1 (1968)

„Let us change our traditional attitude to the construction of programs: Instead of imagining that our main task is to instruct a computer what to do, let us concentrate rather on explaining to human beings what we want a computer to do.“

—  Donald Ervin Knuth, Literate Programming
Literate Programming (1984), "Literate Programming", The Computer Journal 27 (1984), p. 97. (Reprinted in Literate Programming, 1992, p. 99.) Ref: en.wikiquote.org - Donald Knuth / Quotes / Literate Programming (1984)

„The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil (or at least most of it) in programming.“

—  Donald Ervin Knuth, Literate Programming
Computer Programming as an Art (1974), p. 671 Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%. Variant in Knuth, "Structured Programming with Goto Statements" http://pplab.snu.ac.kr/courses/adv_pl05/papers/p261-knuth.pdf. Computing Surveys 6:4 (December 1974), pp. 261–301, §1. Knuth refers to this as "Hoare's Dictum" 15 years later in "The Errors of Tex", Software—Practice & Experience 19:7 (July 1989), pp. 607–685. However, the attribution to C. A. R. Hoare is doubtful. http://shreevatsa.wordpress.com/2008/05/16/premature-optimization-is-the-root-of-all-evil/ All three of these papers are reprinted in Knuth, Literate Programming, 1992, Center for the Study of Language and Information ISBN 0937073806

„Trees sprout up just about everywhere in computer science…“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. IV - A, Combinatorial Algorithms, Section 4.2.1.6 (2011)

„I can’t be as confident about computer science as I can about biology. Biology easily has 500 years of exciting problems to work on. It’s at that level.“

—  Donald Ervin Knuth
Computer Literacy Bookshops Interview http://karthikr.wordpress.com/2006/04/06/donald-knuth-%e2%80%94-computer-literacy-bookshops-interview-1993/ Computer Literacy Bookshops Interview (1993) On why bioinformatics is very exciting

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„I can&rsquo; t go to a restaurant and order food because I keep looking at the fonts on the menu.“

—  Donald Ervin Knuth
[Knuth, Donald, 2002, All Questions Answered, Notices of the AMS, 49, 3, 321, http://www.ams.org/notices/200203/fea-knuth.pdf, PDF]

„Any inaccuracies in this index may be explained by the fact that it has been sorted with the help of a computer.“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. III, Sorting and Searching, End of index (1973)

„The sun comes up just about as often as it goes down, in the long run, but this doesn't make its motion random.“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. II, Seminumerical Algorithms, Section 3.3.2 part B, first paragraph (1969)

„By understanding a machine-oriented language, the programmer will tend to use a much more efficient method; it is much closer to reality.“

—  Donald Ervin Knuth, livro The Art of Computer Programming
The Art of Computer Programming (1968–2011), Vol. I, preface (October 1967) to the first edition. (p. x 1973, p. ix 1997)

„The whole thing that makes a mathematician’s life worthwhile is that he gets the grudging admiration of three or four colleagues.“

—  Donald Ervin Knuth
Jack Woehr. An interview with Donald Knuth http://www.drdobbs.com/an-interview-with-donald-knuth/184409858. Dr. Dobb's Journal, pages 16-22 (April 1996)

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“

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