Heytesbury, William; Spade, Paul Vincent - On 'Insoluble' Sentences. Chapter One of his 'Rules for Solving Sophisms'. Translated and with an Introduction and Study by Paul Vincent Spade.

Toronto, Pontifical Institute of Mediaeval Studies, 1979, paperbound, small 8vo, 111 pp., Volume 21 of Series 'Mediaeval Sources in Translation'; very good condition. . .

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