Revision history for entry Boolos, George; McGee, Vann (1987). "The degree of the set of sentences of predicate provability logic that are true under every interpretation" [BOOTDO]

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2017-02-01T00:43:58updateSystem / admin update -
2016-06-30T13:07:02updateSystem / admin update -
2015-02-05T06:53:01updateSystem / admin update -
2013-11-04T10:49:05updateSystem / admin update -
2013-11-04T09:21:31updateSystem / admin update -