还有一类称之为反经典公理：存在一个形式系统t，一个公理s，排中律lem使得 t一致，t+s一致，t+lem一致，t+s+lem不一致 s就是反经典公理，t+s就是排中律的反模型。“mltt [2] +ua [3].
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