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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2020-05-26 13:37:49 -07:00
parent a1991d803f
commit 33cdc06eb4
1 changed files with 1 additions and 1 deletions
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src/smt/seq_regex.cpp
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@ -299,7 +299,7 @@ namespace smt {
}
/**
nonempty(R union Q, Seen) = R = {} or Q = {}
nonempty(R union Q, Seen) = R != {} or Q != {}
nonempty(R[if(p,R1,R2)], Seen) = if(p, nonempty(R[R1], Seen), nonempty(R[R2], Seen)) (co-factor)
nonempty(R, Seen) = nullable(R) or (R not in Seen and nonempty(D(first(R),R), Seen u { R })) (derivative)