Theorem 1 If VS(I+, I−) is nonempty, then:
(∀x ∈ Rn)((∀h ∈ VS(I+, I−))(h(x) = +1) ↔ VS(I+, I− ∪ {x}) = ∅),
(∀x ∈ Rn)((∀h ∈ VS(I+, I−))(h(x) = −1) ↔ VS(I+ ∪ {x}, I−) = ∅).
Theorem 1 If VS(I+, I−) is nonempty, then:(∀x ∈ Rn)((∀h ∈ VS(I+, I−))(h(x) = +1) ↔ VS(I+, I− ∪ {x}) = ∅),(∀x ∈ Rn)((∀h ∈ VS(I+, I−))(h(x) = −1) ↔ VS(I+ ∪ {x}, I−) = ∅).
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