[Haskell-cafe] lambda calculus and equational logic

Hi, In Haskell what roles are played by 1)lambda calculus and 2) equational logic? Are these roles related? Hopefully this question can be answered at a level suitable for this forum. Thanks, Pat This message has been scanned for content and viruses by the DIT Information Services E-Mail Scanning Service, and is believed to be clean. http://www.dit.ie