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The lexicographic closure of any given finite set D of normal defaults isdefined. A conditional assertion "if a then b" is in this lexicographic closureif, given the defaults D and the fact a, one would conclude b. Thelexicographic closure is essentially a rational extension of D, and of itsrational closure, defined in a previous paper. It provides a logic of normaldefaults that is different from the one proposed by R. Reiter and that is richenough not to require the consideration of non-normal defaults. A large numberof examples are provided to show that the lexicographic closure corresponds tothe basic intuitions behind Reiter's logic of defaults.

Another perspective on default reasoning