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News
August 2016
Shen
Professional 10 moves into the cloud and acquires graphics.
June 2016
Shen
Professional includes provision for large scale file handling.
May 2016
Shen
Professional includes a computably effective axiomatic semantics
P for generating formal descriptions of Shen programs in
secondorder logic.
April 2016
Shen
Professional supports SML 1.0. Shen Markup Language
generates HTML from type secure Shen.
March 2016
Shen
Professional supports full concurrency  communicating parallel
processes with local state.
February 2016
Shen
Professional supports noncommunicating parallel processes.
September 2015
Shen
Professional is launched  the project to build a commercial
closedsource version of Shen.
February 2015
The Shen kernel
goes BSD.

Shen
is a portable functional programming language that offers
 pattern
matching,
 lambda
calculus consistency,
 macros,
 optional lazy
evaluation,
 static type
checking,
 one of the
most powerful systems for typing in functional programming,
 portability
over many languages,
 an integrated
fully functional Prolog,
 and an inbuilt
compilercompiler.
The word ‘Shen’ is
Chinese for 'spirit' and our motto reflects our desire to liberate
our work to live under many platforms. The Shen kernel is under BSD
and currently runs under CLisp, SBCL, Clojure, Scheme, Ruby, Python,
the JVM, Haskell and Javascript. To begin to learn Shen, browse the
Learn Shen section.
We host an
interactive Javascript page of the Shen REPL from this site  to use
it click
here.
Shen
Professional is a closed source high performance
development of the Shen kernel incorporating features for commercial
deliverables.

Want to learn
Shen from the ground up?
Shen has
emerged as one of the most portable and farreaching
integrations of two great programming paradigms  functional
and logic programming. The third edition to The Book of Shen
gives the foundations of both those disciplines, exploring
both lambda calculus, type theory, first  order and Horn
clause logic in a text which is rich in worked examples. In
the course of 400 pages, the text gives a complete formal
and informal exposition of Shen.
Order from Amazon


Want to learn
the logical background to Shen?
Beginning with
a review of formal languages and their syntax and semantics,
Logic, Proof and Computation conducts a computer assisted
course in formal reasoning and the relevance of logic to
mathematical proof, information processing and philosophy.
Topics covered include formal grammars, semantics of formal
languages, sequent systems, truthtables, propositional and
first order logic, identity, proof heuristics,
regimentation, set theory, databases, automated deduction,
proof by induction, Turing machines, undecidability and a
computer illustration of the reasoning underpinning Godel's
incompleteness proof. LPC is designed as a multidisciplinary
reader for students in computing, philosophy and
mathematics.
Order from Amazon 
