6001 structure & interpretation of computer programs recitation 4/ september 17, 1997
overview
a simple problem
free variables in procedures
scope
substitution model revisited
hole in the scope
safe substitution
a related problem
good question #1
good question #2
good question #3
summary
Email: dnj@lcs.mit.edu
Home Page: http://www.pdos.lcs.mit.edu/~dnj
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