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...Ant Fugue. An imitation of a musical fugue: each voice enters with the same statement. The
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theme-holism versus reductionism-is introduced in a recursive picture composed of words
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composed of smaller words, etc. The words which appear on the four levels of this strange picture
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are "HOLISM", "REDLCTIONIsM", and "ML". The discussion veers off to a friend of the
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Anteater's Aunt Hillary, a conscious ant colony. The various levels of her thought processes are
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the topic of discussion. Many fugal tricks are ensconced in the Dialogue. As a hint to the reader,
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references are made to parallel tricks occurring in the fugue on the record to which the foursome
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is listening. At the end of the Ant Fugue, themes from the Prelude return, transformed
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considerably.
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Chapter XI: Brains and Thoughts. "How can thoughts he supported by the hardware of the brain is
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the topic of the Chapter. An overview of the large scale and small-scale structure of the brain is
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first given. Then the relation between concepts and neural activity is speculatively discussed in
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some detail.
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English French German Suite. An interlude consisting of Lewis Carroll's nonsense poem
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"Jabberwocky' 1 together with two translations: one into French and one into German, both done
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last century.
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Chapter XII: Minds and Thoughts. The preceding poems bring up in a forceful way the question
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of whether languages, or indeed minds, can be "mapped" onto each other. How is communication
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possible between two separate physical brains: What do all human brains have in common? A
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geographical analogy is used to suggest an answer. The question arises, "Can a brain be
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understood, in some objective sense, by an outsider?"
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Aria with Diverse Variations. A Dialogue whose form is based on Bach's Goldberg Variations, and
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whose content is related to number-theoretical problems such as the Goldbach conjecture. This
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hybrid has as its main purpose to show how number theory's subtlety stems from the fact that
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there are many diverse variations on the theme of searching through an infinite space. Some of
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them lead to infinite searches, some of them lead to finite searches, while some others hover in
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between.
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Chapter XIII: BIooP and FlooP and GIooP. These are the names of three computer languages.
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BIooP programs can carry out only predictably finite searches, while FlooP programs can carry
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out unpredictable or even infinite searches. The purpose of this Chapter is to give an intuition for
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the notions of primitive recursive and general recursive functions in number theory, for they are
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essential in Godel’s proof.
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Air on G's String. A Dialogue in which Godel’s self-referential construction is mirrored in words.
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The idea is due to W. V. O. Quine. This Dialogue serves as a prototype for the next Chapter.
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Chapter XIV: On Formally Undeeidable Propositions of TNT and Related Systems. This
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Chapter's title is an adaptation of the title of Godel’s 1931 article, in which his Incompleteness
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Theorem was first published. The two major parts of Godel’s proof are gone through carefully. It
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is shown how the assumption of consistency of TNT forces one to conclude that TNT (or any
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similar system) is incomplete. Relations to Euclidean and non-Euclidean geometry are discussed.
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Implications for the philosophy of mathematics are gone into with some care.
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Overview
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XI
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Birthday Cantatatata ... In which Achilles cannot convince the wily and skeptical Tortoise that today
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is his (Achilles') birthday. His repeated but unsuccessful tries to do so foreshadow the
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repeatability of the Godel argument.
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Chapter XV: Jumping out of the System. The repeatability of Godel’s argument is shown, with
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the implication that TNT is not only incomplete, but "essentially incomplete The fairly notorious
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argument by J. R. Lucas, to the effect that Godel’s Theorem demonstrates that human thought
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cannot in any sense be "mechanical", is analyzed and found to be wanting.
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Edifying Thoughts of a Tobacco Smoker. A Dialogue treating of many topics, with the thrust being
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problems connected with self-replication and self-reference. Television cameras filming
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television screens, and viruses and other subcellular entities which assemble themselves, are
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among the examples used. The title comes from a poem by J. S. Bach himself, which enters in a
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peculiar way.
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Chapter XVI: Self-Ref and Self-Rep. This Chapter is about the connection between self-reference
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in its various guises, and self-reproducing entities e.g., computer programs or DNA molecules).
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The relations between a self-reproducing entity and the mechanisms external to it which aid it in
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reproducing itself (e.g., a computer or proteins) are discussed-particularly the fuzziness of the
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distinction. How information travels between various levels of such systems is the central topic of
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this Chapter.
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The Magnificrab, Indeed. The title is a pun on Bach's Magnifacat in D. The tale is about the Crab,
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who gives the appearance of having a magical power of distinguishing between true and false
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statements of number theory by reading them as musical pieces, playing them on his flute, and
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determining whether they are "beautiful" or not.
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Chapter XVII: Church, Turing, Tarski, and Others. The fictional Crab of the preceding Dialogue
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is replaced by various real people with amazing mathematical abilities. The Church-Turing
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Thesis, which relates mental activity to computation, is presented in several versions of differing
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strengths. All are analyzed, particularly in terms of their implications for simulating human
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thought mechanically, or programming into a machine an ability to sense or create beauty. The
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connection between brain activity and computation brings up some other topics: the halting
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problem of Turing, and Tarski's Truth Theorem.
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SHRDLU, Toy of Man's Designing. This Dialogue is lifted out of an article by Terry Winograd on
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his program SHRDLU: only a few names have been changed. In it. a program communicates
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with a person about the so-called "blocks world" in rather impressive English. The computer
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program appears to exhibit some real understanding-in its limited world. The Dialogue's title is
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based on Jesu, joy of Mans Desiring , one movement of Bach's Cantata 147.
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Chapter XVIII: Artificial Intelligence: Retrospects, This Chapter opens with a discussion of the
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famous "Turing test"-a proposal by the computer pioneer Alan Turing for a way to detect the
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presence or absence of "thought" in a machine. From there, we go on to an abridged history of
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