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∀x,t[(x∈U)t→∃t'[t'>t∧∼(x∈U)t']]

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current by |˟˟| & ∀x,t[(x∈U)t→∃t'[t'>t∧∼(x∈U)t']]
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|˟˟| & ∀x,t[(x∈U)t→∃t'[t'>t∧∼(x∈U)t']], 2011