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# Topic: Turing machine

 Turing machine - Wikipedia, the free encyclopedia Turing machines are extremely basic symbol-manipulating devices which — despite their simplicity — can be adapted to simulate the logic of any computer that could possibly be constructed. The thesis states that Turing machines indeed capture the informal notion of effective method in logic and mathematics, and provide a precise definition of an algorithm or 'mechanical procedure'. A Turing machine is equivalent to a pushdown automaton made more powerful by relaxing the last-in-first-out requirement of its stack. en.wikipedia.org /wiki/Turing_machine   (3442 words)

 Alan Turing - Wikipedia, the free encyclopedia Turing was conceived in 1911 in Chatrapur, India. Turing machines are to this day the central object of study in theory of computation. A celebration of Turing's life and achievements was held at the University of Manchester on 5 June 2004; it was arranged by the British Logic Colloquium and the British Society for the History of Mathematics. en.wikipedia.org /wiki/Alan_Turing#Prosecution_for_homosexuality_and_Turing.27s_death   (3177 words)

 Turing Machines Turing proposed a class of devices that came to be known as Turing machines. The action of a Turing machine is determined completely by (1) the current state of the machine (2) the symbol in the cell currently being scanned by the head and (3) a table of transition rules, which serve as the “program” for the machine. The complete state of a Turing machine at any point during a computation may be described by the name of the state that the machine is in, the symbols on the tape, and the cell that is currently being scanned. plato.stanford.edu /entries/turing-machine   (5456 words)

 Dictionary of Philosophy of Mind - Turing machine   (Site not responding. Last check: 2007-10-22) Turing was able to show that this machine is able to perform all the operations a person working with a logical system would be able to perform. The Turing machine has had a central role in theories of computation and computability since the mid 1930s when they were introduced as a rigorous means of defining the concept of 'method' (or algorithm) by Alan Turing. Turing was able to show that the Turing machine was a mechanical process that was able to perform all the operations a person working with a logical system would be able to perform. www.artsci.wustl.edu /~philos/MindDict/turingmachine.html   (632 words)

 What is a Turing Machine? A Turing machine is an automaton which moves along a linear strip of data and performs certain actions according its state, which depends upon the data it has 'seen,' and the datum symbol that it is viewing. Turing and Emil Post independently proved that determining the decidability of mathematical propositions is equivalent to asking what sorts of sequences of a finite number of symbols can be recognized by an abstract machine with a finite set of instructions. Turing machines are restricted to a finite number of states. www.science.gmu.edu /~jsteidel/801-prj/turing.html   (907 words)

 The Church-Turing Thesis Turing did not show that his machines can solve any problem that can be solved "by instructions, explicitly stated rules, or procedures", nor did he prove that the universal Turing machine "can compute any function that any computer, with any architecture, can compute". Turing introduces his machines with the intention of providing an idealised description of a certain human activity, the tedious one of numerical computation, which until the advent of automatic computing machines was the occupation of many thousands of people in business, government, and research establishments. Copeland, B.J. ‘Turing's O-machines, Penrose, Searle, and the Brain’. plato.stanford.edu /entries/church-turing   (4930 words)

 Universal Turing Machine in XSLT The Turing machine moves its tape head one symbol to the left or to the right, or does not move the tape head, depending on the value of the 'movement' attribute that is returned by the transition function. If the Turing machine moves the tape head to the right of the rightmost symbol, then a blank symbol is appended to the end of the tape and this new blank symbol becomes the current symbol. If the Turing machine moves the tape head to the left of the leftmost symbol, then a blank symbol is inserted at the beginning of the tape and this new blank symbol becomes the current symbol. www.unidex.com /turing/utm.htm   (914 words)

 Turing's World: More Information (1)   (Site not responding. Last check: 2007-10-22) A Turing machine is a particularly simple kind of computer, one whose operations are limited to reading and writing symbols on a tape, or moving along the tape to the left or right. A Turing machine has a finite number of states and is in exactly one of these states at any given time. The states of a Turing machine are generally represented by a flow or state diagram, using circles for the states and labelled arcs for the instructions associated with those states. www-csli.stanford.edu /hp/Turing1.html   (536 words)

 xTuringMachine Lab The purpose of the machine is to multiply the length of the string by 3. The purpose of the machine is to divide the length of the string by 3. The machine should write a string of \$'s, where the number of \$'s is given by the binary number that was initially on the tape. math.hws.edu /TMCM/java/labs/xTuringMachineLab.html   (4113 words)

 Alan Turing Scrapbook - Turing Machines Turing argued that his formalism was sufficiently general to encompass anything that a human being could do when carrying out a definite method. Turing used his definition of an uncomputable number to answer Hilbert's question in the negative: there can be no one definite method capable of deciding whether or not a given mathematical statement is provable. Turing machines, regarded as the foundation of 'classical' computing, also provided the model in the 1980s for the new theory of quantum computing. www.turing.org.uk /turing/scrapbook/machine.html   (2124 words)

 computing machinery and intelligence - a.m. turing, 1950 If the meaning of the words 'machine' and 'think 'are to be found by examining how they are commonly used it is difficult to escape the conclusion that the meaning and the answer to the question, 'Can machines think?' is to be sought in a statistical survey such as a Gallup poll. To 'programme a machine to carry out the operation A' means to put the appropriate instruction table into the machine so that it will do A. An interesting variant on the idea of a digital computer is a 'digital computer with a random element'. The machine has to be so constructed that events which shortly preceded the occurrence of a punishment-signal are unlikely to be repeated, whereas a reward-signal increased the probability of repetition of the events which led up to it. www.abelard.org /turpap/turpap.htm   (11247 words)

 The Turing Machine and Universal Computation   (Site not responding. Last check: 2007-10-22) Turing put forward the question that if M is a Turing Machine and S a sequence of 0's and 1's, is there a Turing Machine that can decide if M ever halts when given S as input. An oracle Turing Machine is described as a machine that is connected to an oracle. Turing showed that the Turing Machine could simulate any other computing machine and human beings are also like computers, (Before the publication of Turing’s 1936 paper the term computer was generally applied to human begins), thus the Human computer could also be successfully simulated by the Turing Machine. www.rit.edu /~maa2454/turing1.html   (2867 words)

 Alan Mathison Turing Turing seemed to have little interest in using the work of previous scientists; he would typically spend time recreating their work instead. Turing's ultimate goal was to merge already established biological theory with mathematics and computers to create his intelligent, multi-purpose machine. Turing died on June 7, 1954 from what the medical examiners described as, "self-administered potassium cyanide while in a moment of mental imbalance." Other reasons for his death have surfaced. ei.cs.vt.edu /~history/Turing.html   (1876 words)

 Drawings Gallery :: The Universal Turing Machine   (Site not responding. Last check: 2007-10-22) This is a biographical illustration and portrait of the man named Alan Turing, drawn as and titled after the creation for which he is most famous: the Universal Turing Machine. One of the founders of modern computer science and the field of artificial intelligence, he dreamed of an abstract idea which came to be known as the Turing Machine — something we would recognize today as a computer, before such a thing ever existed. Turing, he was openly homosexual at a time when such things were socially unacceptable. www.jinwicked.com /art/drawings/turing.html   (386 words)

 Turing machine In its simplest form, a Turing machine is composed of a "tape", a ribbon of paper of indefinite length. The Turing machine is said to be in a certain "state". One reason to build the automaton with append instead of the original Turing machine was that I avoided building a bi directional (near) infinite tape. mapageweb.umontreal.ca /cousined/lego/5-Machines/Turing/Turing.html   (1442 words)

 Turing Machine Simulator   (Site not responding. Last check: 2007-10-22) Turing Machines are abstract models of primitive digital computers. Such a machine was conceived by the British mathematician Alan Turing in 1935, long before digital computers became established. TURING provides a tape with 999 elements, all of which must be 0 or 1. archives.math.utk.edu /software/msdos/miscellaneous/jkturing/.html   (192 words)

 JavaScript Turing Machines Continue to the Scrapbook page on Alan Turing and his Turing machines for more general information on the machine concept. Machine 2 performs a divisibility test: the machine will stop with an X printed in the original blank square separating the numbers if and only if the number on the left divides exactly into the number on the right. Machine 3 uses this divisibility test as the basis for a primality test: the machine stops with an X in the original square if and only if the number on the right is prime. www.turing.org.uk /turing/scrapbook/tmjava.html   (246 words)

 Virtual Turing Machine He also invented a concept of a type of computer, called a "Turing Machine." Theoretically, a Turing machine is just as powerful as any other computer. Conceptually, a Turing Machine has a finite set of states, a finite alphabet (that has a blank symbol), and a finite set of instructions. That means the machine will halt no matter what value it encounters once it's in state 's1'. www.nmia.com /~soki/turing   (729 words)

 Visual Turing: a graphical IDE for Turing machines You may run the machines you have created or you may debug them using breakpoints, step by step execution and watch variables. This software is freeware but you may buy the source code for \$39 to see how it was written or to use parts of it in your projects. Turing and the Computer (The Big Idea).Turing and the Computer offers an encapsulation of the groundwork that led to the invention of the computer as we know it and an absorbing account of the man who helped develop it cheransoft.com /vturing   (171 words)

 Turing machine   (Site not responding. Last check: 2007-10-22) Definition: A model of computation consisting of a finite state machine controller, a read-write head, and an unbounded sequential tape. Depending on the current state and symbol read on the tape, the machine can change its state and move the head to the left or right. Unless otherwise specified, a Turing machine is deterministic. www.nist.gov /dads/HTML/turingMachine.html   (196 words)

 Turing Machine Markup Language The Turing Machine Markup Language (TMML) is an XML language for describing Turing machines. The differences among these definitions are not significant; in general, a Turing machine that conforms to one definition can be easily converted into an equivalent Turing machine that conforms with another definition. A Turing machine that calculates the length of a string. www.unidex.com /turing/tmml.htm   (257 words)

 Alan Turing invents the Turing Machine people who designed the early computers were both geniuses and eccentrics of the first order, and the English mathematician Alan Turing was first among equals. One of the premises of Turing's paper was that some classes of mathematical problems do not lend themselves to algorithmic representations and are not amenable to solution by automatic computers. " A few years later Turing was destined to be a key player in the design and creation of COLOSSUS, which was one of the world's earliest working programmable electronic digital computers. www.maxmon.com /1937bad.htm   (170 words)

 Jade Tree | Bands The Jade Tree - Turing Machine connection is far more outstretched than their first album's copyright date might lead you to believe. Taking its cue from their art-punk pasts, while nodding to the kraut, progressive, and modern indie rock movements, Turing Machine's sound is probably more analog than digital - surprising, considering the invaluable input of typically-techno producers Tim Goldsworthy and James Murphy, who manned the board for the debut. We finally have the Turing Machine "Wires" t-shirts back in stock, so if you ordered before and were out of luck, now is the perfect time to make that order.... www.jadetree.com /bands/artist/turing_machine   (366 words)

 Warthman Associates, Technical Writer - Turing Machine Java Animation   (Site not responding. Last check: 2007-10-22) The animation shows the flow of events in the calculation (the writing and reading of symbols on an endless tape) and the decision rules used to process each step in the calculation. An explanation of the Turing Machine can be seen in the applet by clicking the button entitled "How the Applet Works". If the applet does not appear after several seconds, or if it continues to appear all gray, you may be behind a corporate firewall that blocks incoming Java applets. www.warthman.com /ex-turing.htm   (141 words)

 MAW 97 CIPHERS The Turing Machine   (Site not responding. Last check: 2007-10-22) Turing's World by Jon Barwise and John Etchemendy is a self-contained introduction to Turing machines. It allows the user to design, debug, and run sophisticated Turing machines on a Macintosh. A Finite State Machine tutorial from Mathmania, the University of Victoria, British Columbia. math.arizona.edu /~dsl/tmachine.htm   (94 words)

 Turing Machine (C++ Simulator) A Turing Machine with faults, failures and recovery =================== //######################################################### //-------------------- Running : BEGIN -------------------- %turing.exe -h See results in Log File (for Deterministic Turing Machine). %turing.exe See results in Log File (for Deterministic Turing Machine). alexvn.freeservers.com /s1/turing.html   (176 words)

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