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Theorem mailboxNotNull-def

⊦ mailboxNotNull(s) ↔ (∀ cmd, ag. s(Mailbox(cmd), ag) ≠ null → (∀ str0, ag0. s(state(str0), ag0) = null) ∧ (∀ cmd0, ag0. ag ≠ ag0 ∨ cmd0 ≠ cmd → s(Mailbox(cmd0), ag0) = null))