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Proof step 4 from proof reachless-edge (previous step)

b ∈ succ(a), reach(source, a, m), m < n0 ⊦ # succ(a) = 0, succ(a) = ∅, ∃ c. reach(source, c, m) ∧ b ∈ succ(c)

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

[EXRARG : pos: right 3, [QUANTTERMLIST : (a)]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (a)]]