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Proof step 4 from proof BFS-correct-if-reachable (previous step)

S0 = ∅, S = ∅, ¬ done0, 0 = n - n0, INV(∅, ∅, S1, n0, source), INVR(∅, ∅, S1, n0, n, source, dest), ((done0 ⊃ some(n0); fail)) ≠ some(n) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
0 = n - n0, INV(∅, ∅, S1, n0, source), INVR(∅, ∅, S1, n0, n, source, dest) ⊦

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ some(m) ≠ fail])]]