: Re: The manuscript Summa Logicae (William of Ockham) The Summa Logicae (Latin, in English it's the Sum of Logic) is a textbook on logic by William of Ockham. There are articles about the Summa

@Murray165

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Yale Digital Content reports that it holds:

William of Ockham, Summa Logicae, etc. General Collection, Beinecke Rare Book and Manuscript Library, Yale University.
Manuscript on paper (thick, coarse, some deckle edges; watermarks indistinguishable) of William of Ockham, Summa logicae. With Walter Burley, De puritate artis logicae tractatus brevior, beginning of text only.
Creator: William, of Ockham, ca. 1285-ca. 1349.
Publisher: Italy,
Publication Date: [between 1400 and 1450]
Type: Archives or manuscripts
Physical Description: ff. i + 125 + i: paper ; 222 x 145 (195 x 110) mm.

Note that it is desribed as Written by a single scribe in small, cramped and highly abbreviated gothic cursive, so it is presumably not a "first edition". But given that it apparently predates your date for first publication (1488?), it may be useful.

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