X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=offsite_reading.mdwn;h=d4b710124a20c2020a2665a664f0068c79f101a9;hp=db538fa2f1e943e7ab5dcc14f094702c7e3de506;hb=043cdafb6314cb4e7afb5c474e96064ad6ffa7cf;hpb=4afd53161bf6968e78fef04e792c3d32018c3544

diff --git a/offsite_reading.mdwn b/offsite_reading.mdwn
index db538fa2..d4b71012 100644
--- a/offsite_reading.mdwn
+++ b/offsite_reading.mdwn
@@ -12,7 +12,7 @@ first encountering. Or perhaps several of these at once. We hope you will
 already have mastered the skill of leveraged reading: getting what you can out
 of an article you don't fully understand, so that you can discuss it with the rest of
 the group and hopefully get to a point where you can read it again and
-get more out of out. (Rinse and repeat.)
+get more out of. (Rinse and repeat.)
 
 
 ## General issues about variables and binding in programming languages ##
@@ -45,13 +45,17 @@ get more out of out. (Rinse and repeat.)
 *	[[!wikipedia Lambda calculus]]
 *	[Chris Barker's Lambda Tutorial](http://homepages.nyu.edu/~cb125/Lambda)
 *	[Lambda Animator](http://thyer.name/lambda-animator/)<p>
-*	[[!wikipedia Haskell Curry]]
+<!-- Haskell Curry had ideas that he felt were validated upon reading a 1924 paper by M. Schönfinkel "Uber die Bausteine der mathematischen Logik" which used combinators in a similar way to his own ideas. Haskell then wrote "An analysis of logical substitution" which appeared in the American Journal of Mathematics in 1929. -->
 *	[[!wikipedia Moses Schönfinkel]]
+*	[[!wikipedia Haskell Curry]]
 *	[[!wikipedia Alonzo Church]]<p>
 *	[[!wikipedia Combinatory logic]]
 *	[Combinatory logic](http://plato.stanford.edu/entries/logic-combinatory/) at the Stanford Encyclopedia of Philosophy
 *	[[!wikipedia SKI combinatory calculus]]
-*	[[!wikipedia B,C,K,W system]]<p>
+*	[[!wikipedia B,C,K,W system]]
+	<!-- Jeroen Fokker, The Systematic Construction of a One-combinator Basis for Lambda-Terms. Formal Aspects of Computing 4 (1992), pp. 776-780
+	http://people.cs.uu.nl/jeroen/article/combinat/combinat.ps -->
+*	[Chris Barker's Iota and Jot]() (broken link)<p>
 *	[[!wikipedia Church-Rosser theorem]]
 *	[[!wikipedia Normalization property]]
 *	[[!wikipedia Turing completeness]]<p>
@@ -85,9 +89,13 @@ Revised Revised Report..." and so on, or "The Revised^n Report..." for
 short. One widely implemented standard is [The
 Revised^5 Report on Scheme](http://www.schemers.org/Documents/Standards/R5RS/HTML/),
 or R5RS, published in 1998.
-A new standard [R6RS](http://www.r6rs.org/final/html/r6rs/r6rs.html) was ratified
-in 2007, but this has many detractors and has not been fully accepted in the
-community. ([Libraries for R6RS](http://www.r6rs.org/final/html/r6rs-lib/r6rs-lib.html))
+A new standard [R6RS](http://www.r6rs.org/final/html/r6rs/r6rs.html) ([Libraries for R6RS](http://www.r6rs.org/final/html/r6rs-lib/r6rs-lib.html))
+was ratified in 2007, and this is implemented in Racket; but it also has many detractors and has not been fully
+accepted in the community. As a result, the Scheme language [may in the future split](http://scheme-reports.org/2009/position-statement.html)
+into a lean, minimal base, closer to
+R5RS Scheme, and a richer language like R6RS Scheme that standardizes many of the add-ons that programmers tend to build
+on top of the base.
+
 *	[Scheme FAQ](http://community.schemewiki.org/?scheme-faq)
 *	[Scheme Requests for Implementation](http://srfi.schemers.org/) (SRFI)
 *	The [Schematics Scheme Cookbook](http://schemecookbook.org/) is a collaborative effort to produce documentation and recipes for using Scheme for common tasks.
@@ -117,6 +125,7 @@ community. ([Libraries for R6RS](http://www.r6rs.org/final/html/r6rs-lib/r6rs-li
 
 *	[[!wikipedia Tagged union]]
 *	[[!wikipedia Algebraic data type]]
+*	[[!wikipedia Recursive data type]]
 *	[[!wikipedia Pattern matching]]
 *	[[!wikipedia Unit type]]
 *	[[!wikipedia Bottom type]]
@@ -125,7 +134,8 @@ community. ([Libraries for R6RS](http://www.r6rs.org/final/html/r6rs-lib/r6rs-li
 *	[Type Theory](http://plato.stanford.edu/entries/type-theory/) at the Stanford Encyclopedia of Philosophy
 *	[Church's Type Theory](http://plato.stanford.edu/entries/type-theory-church/) at the Stanford Encyclopedia of Philosophy
 *	The [[!wikipedia Curry-Howard isomorphism]]
-*	[The Curry-Howard correspondence in Haskell](http://www.thenewsh.com/~newsham/formal/curryhoward/)<p>
+*	[The Curry-Howard correspondence in Haskell](http://www.thenewsh.com/~newsham/formal/curryhoward/)
+*	[The Curry-Howard Isomorphism](http://en.wikibooks.org/wiki/Haskell/The_Curry-Howard_isomorphism) at Haskell wiki<p>
 *	[[!wikipedia Type polymorphism]]
 *	[[!wikipedia System F]]