The Lambda Calculus - An Introduction
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LISP is awesome. No, stop laughing. Haskell is awesome too. Both are notable for the way that they expand your way of thinking about computation.
Lambda Calculus lies at the core of these two styles of programming. Come out and hear Tim Newsham introduce us to these interesting and mind-expanding ideas.
== Ways to learn more ==
Wikipedia:
http://en.wikipedia.org/wiki/Lambda_calculus
Online tutorial:
http://classes.soe.ucsc.edu/cmps112/Spring03/readings/lambdacalculus/project3.html
A painless tutorial:
http://www.inf.fu-berlin.de/lehre/WS03/alpi/lambda.pdf