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@@ -14,6 +14,7 @@ See also:
 
 *      [Chris Barker's Lambda Tutorial](http://homepages.nyu.edu/~cb125/Lambda)
 *      [Lambda Animator](http://thyer.name/lambda-animator/)
 
 *      [Chris Barker's Lambda Tutorial](http://homepages.nyu.edu/~cb125/Lambda)
 *      [Lambda Animator](http://thyer.name/lambda-animator/)

+*       [Penn lambda calculator](http://www.ling.upenn.edu/lambda/) Pedagogical software developed by Lucas Champollion, Josh Tauberer and Maribel Romero.  Linguistically oriented. 

 *      MORE
 
 The lambda calculus we'll be focusing on for the first part of the course has no types. (Some prefer to say it instead has a single type---but if you say that, you have to say that functions from this type to this type also belong to this type. Which is weird.)
 *      MORE
 
 The lambda calculus we'll be focusing on for the first part of the course has no types. (Some prefer to say it instead has a single type---but if you say that, you have to say that functions from this type to this type also belong to this type. Which is weird.)