This article is within the scope of WikiProject Computer science, a collaborative effort to improve the coverage of Computer science related articles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
If the 1000 lines fact should be included, I think it should have a supporting quotation. Furthermore, I think there should be a reference to deBruijns program of constructing a formally verified proof checker. Kgrue (talk) 14:57, 9 January 2010 (UTC)