perm filename APOLOG.XGP[LSP,JRA] blob sn#129972 filedate 1974-11-12 generic text, type T, neo UTF8
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␈↓"∧
␈↓"∧
␈↓"∧␈↓ ↓H**amibit  g.a.   **abstract  compilers  **chapters:  static  &  dynamic
␈↓"∧
␈↓"∧␈↓ ↓H**additional:  s-lisp;
␈↓"∧
␈↓"∧␈↓ ↓H**crap␈α↓ on a.i.␈α↓ impl: control,␈α↓ pattern match,␈α↓ and␈α↓ d.b.(perhaps  as
␈↓"∧␈↓ ↓Hprojects␈α↓ instead of␈α↓          current.  **fixes␈α↓ in λ-calc,␈α↓ and  mtc
␈↓"∧␈↓ ↓Hsections
␈↓"∧
␈↓"∧␈↓ ↓H**"gentle"  reminders  in  existing  text.
␈↓"∧
␈↓"∧␈↓ ↓H**more  problems.
␈↓"∧
␈↓"∧␈↓ ↓H*self-contained  u.g.  to  b.  grad
␈↓"∧
␈↓"∧
␈↓"␈↓ ↓Hpossible  reviewers
␈↓"∧
␈↓"∧␈↓ ↓H␈↓(cover letter to go to publisher...any comments??)
␈↓"∧
␈↓"∧␈↓ ↓H␈↓To the Patient Reader:
␈↓"∧
␈↓"∧␈↓ ↓H␈↓There␈α⊗ are␈α∃ some␈α⊗ major␈α∃revisions␈α⊗ in␈α∃ progress␈α⊗ on␈α∃ the␈α⊗ Super␈α∃ Lisp
␈↓"∧␈↓ ↓H␈↓manuscript.␈α∨   Sketching␈α∨those␈α  areas␈α∨here␈α∨ will␈α  hopefully␈α∨forestall
␈↓"∧␈↓ ↓H␈↓attempts␈α∩to␈α∩understand␈α∩sections␈α∩which␈α∩ are␈α∩poorly␈α∩done␈α∩and␈α∩have␈α∩ been
␈↓"∧␈↓ ↓H␈↓changed.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓Several␈α≤ revisions␈α≠  are␈α≤ due␈α≤ to␈α≠ persistent␈α≤  criticism␈α≤ from␈α≠ many
␈↓"∧␈↓ ↓H␈↓reviewers;␈α∀ some␈α∀are␈α∀ due␈α∀to␈α∪my␈α∀ general␈α∀discomfort␈α∀ with␈α∀the␈α∪current
␈↓"∧␈↓ ↓H␈↓presentation.␈α_ The␈α↔net␈α_effect␈α↔is␈α_a␈α↔restructuring␈α_ of␈α↔the␈α_two␈α↔chapters
␈↓"∧␈↓ ↓H␈↓entitled␈α)   "Towards␈α*    Implementation"␈α)   [part␈α*   II-sec.6]␈α)   and
␈↓"∧␈↓ ↓H␈↓"Compilation"[II-7].␈α
  These␈α
 two␈α∞ chapters␈α
are␈α
 being␈α
 rewritten␈α∞ to␈α
reflect
␈↓"∧␈↓ ↓H␈↓the␈α≥ static␈α≤structure␈α≥of␈α≤ LISP␈α≥and␈α≤ the␈α≥dynamic␈α≤structure␈α≥ of␈α≤LISP
␈↓"∧␈↓ ↓H␈↓respectively.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓In␈α[II-6],␈αthe␈α section␈αon␈αAMBIT/G␈αis␈αbeing␈αcompletely␈αrewritten.␈αThe␈α
idea␈αof
␈↓"∧␈↓ ↓H␈↓graphical␈α
description␈αof␈α
 an␈α
algorithm␈α as␈α
well␈α
 as␈αdata␈α
 is␈α
worth␈αpresenting,
␈↓"∧␈↓ ↓H␈↓but␈αa␈αvery␈αinformal␈α sketch␈αis␈αall␈αthat␈α is␈αreally␈αnecessary.␈α  The␈α
sections␈αon
␈↓"∧␈↓ ↓H␈↓"syntactic␈α∂dominoes",␈α∂the␈α∂Contour␈α∂ model,␈α∂and␈α∂graphical␈α⊂garbage␈α∂collectors,
␈↓"∧␈↓ ↓H␈↓are out.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓The␈α∂chapter␈α∂on␈α∂compilers␈α∞[II-7]␈α∂for␈α∂LISP␈α∂is␈α∞quite␈α∂incomplete;␈α∂however␈α∂it␈α∞is
␈↓"∧␈↓ ↓H␈↓also␈αmuch␈α too␈αmachine␈αdependent.␈α
 This␈αmaterial␈αhas␈α all␈αbeen␈α
rewritten␈α in
␈↓"∧␈↓ ↓H␈↓a␈α≤ much␈α≤ more␈α≤ abstract␈α≤ style,␈α≤ using␈α≤  constructors,␈α≥selectors,␈α≤and
␈↓"∧␈↓ ↓H␈↓predicates.␈α∀  There␈α∃will␈α∀correspondingly␈α∀be␈α∃ much␈α∀less␈α∀emphasis␈α∃on␈α∀the
␈↓"∧␈↓ ↓H␈↓SM-machine.  What will remain will be moved into the Compiling chapter.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓Throughout␈α⊗the␈α⊗ text,␈α⊗there␈α⊗ will␈α∃be␈α⊗ more␈α⊗emphasis␈α⊗ on␈α⊗writing␈α∃ LISP
␈↓"∧
␈↓"∧
␈↓"∧
␈↓"∧␈↓ ↓H␈↓programs␈α⊗ in␈α↔an␈α⊗ abstract␈α⊗style.␈α↔ This␈α⊗is␈α⊗ one␈α↔of␈α⊗ the␈α⊗few␈α↔ canons␈α⊗of
␈↓"∧␈↓ ↓H␈↓"structured programming" and should be recognized as such.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓There␈α∩are␈α∩a␈α∩few␈α∩topics␈α∩yet␈α∩to␈α∩be␈α∩included.␈α∩The␈α∩temptation␈α∩to␈α∩"keep␈α⊃on
␈↓"∧␈↓ ↓H␈↓writing"␈α⊗should␈α⊗be␈α↔restrained,␈α⊗but␈α⊗one␈α⊗of␈α↔the␈α⊗important␈α⊗ topics␈α↔to␈α⊗be
␈↓"∧␈↓ ↓H␈↓included␈α∃ is:␈α∃just␈α∃what␈α∃ can␈α⊗we␈α∃learn␈α∃ from␈α∃LISP?␈α∃  LISP␈α∃has␈α⊗ been␈α∃an
␈↓"∧␈↓ ↓H␈↓amazingly␈α_durable␈α_language.␈α_ In␈α→attempting␈α_to␈α_understand␈α_LISP␈α→in␈α_ the
␈↓"∧␈↓ ↓H␈↓chapters␈α∀on␈α∀mechanics,␈α∀evaluation,␈α∪its␈α∀ static␈α∀and␈α∀dynamic␈α∀structure,␈α∪we
␈↓"∧␈↓ ↓H␈↓should␈α≠ begin␈α≠to␈α≠understand␈α~what␈α≠makes␈α≠ a␈α≠LISP-like␈α≠language.␈α~This
␈↓"∧␈↓ ↓H␈↓understanding␈αis␈αpart␈αof␈αthe␈α
chapter␈αon␈α"Implications..."␈α[II-8].␈α  A␈α
chapter␈αon
␈↓"∧␈↓ ↓H␈↓"Implications..."␈α"should␈α" also␈α"examine␈α! some␈α"of␈α" the␈α"more␈α!durable
␈↓"∧␈↓ ↓H␈↓characteristics of Artificial Intelligence languages.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓Several␈α↔  existing␈α↔  sections␈α↔  are␈α↔ incomplete.␈α↔  The␈α↔  sections␈α↔ on␈α⊗␈↓↓λ␈↓-
␈↓"∧␈↓ ↓H␈↓calculus␈α⊃[I-4.6]␈α⊃and␈α⊃mathematical␈α⊃semantics␈α⊃[I-4.17]␈α⊃ are␈α⊃quite␈α⊂incomplete
␈↓"∧␈↓ ↓H␈↓and␈α
contain␈α∞some␈α
errors.␈α∞These␈α
sections␈α∞are␈α
being␈α∞revised.␈α
 The␈α∞section␈α
on
␈↓"∧␈↓ ↓H␈↓Weizenbaum␈α$diagrams␈α$ [I-4.9]␈α%has␈α$ been␈α$reworked.␈α% The␈α$current
␈↓"∧␈↓ ↓H␈↓presentation is unclear and the diagrams are hard to read.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓Many␈α
more␈α
problem␈α∞sets␈α
 must␈α
be␈α
included.␈α∞ Any␈α
 contributions␈α
in␈α∞this␈α
area
␈↓"∧␈↓ ↓H␈↓will be gratefully received.
␈↓"∧
␈↓"∧␈↓ ↓H␈↓This␈α≤  manuscript␈α≤ attempts␈α≤ to␈α≤ give␈α≤  a␈α≥ reasonably␈α≤ self-contained
␈↓"∧␈↓ ↓H␈↓presentation.␈α≤  The␈α≤ idea␈α≤ is␈α≤ to␈α≤ give␈α≤ people,␈α≤ with␈α≤ litle␈α≤ or␈α≤ no
␈↓"∧␈↓ ↓H␈↓background␈α→ in␈α→ Computer␈α~ Science,␈α→  a␈α→ proper␈α→ introduction␈α~ to␈α→ the
␈↓"∧␈↓ ↓H␈↓interesting␈α areas␈αof␈α
the␈αfield.␈α I␈α
obviously␈αthink␈α LISP␈αis␈α
the␈αbest␈αway␈α
to␈αdo
␈↓"∧␈↓ ↓H␈↓this.
␈↓"∧