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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 Logicae in Wikipedia and in Logicmuseum.

It was published in Paris in 1488. There are different typed variants of this textbook, for example here (in English).

But I can't find any scans or photos of the original handmade manuscript or the original (first) edition. Do you know any links or libraries or museims, where I can find it?

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Summa doesn't mean sum. It means 'the foremost/greatest things'. I can't help you find it, but I thought it relevant still. – Ian Coley May 8 '13 at 2:48
The only image I've seen is here: – Andrés E. Caicedo May 8 '13 at 3:02
Note that the date in Wikipedia is 1323, and in the picture is 1341. – Andrés E. Caicedo May 8 '13 at 3:08
@Frank: It's not quite that simple. "summa" as an adjective means "foremost/greatest", but since "logicae" is in the genitive, "summa" is being used as a noun. As a noun it can mean, as you say, "the foremost/greatest things", but also has other meanings. The Wikipedia article does translate the title as "Sum of Logic". I think a good analysis of the title is given here: ... – joriki May 8 '13 at 3:12
... "The Latin word Summa is difficult to translate, and does not mean a mere summary of its subject, but rather a comprehensive handbook, or manual or compendium, intended to cover all the salient points of the subject, written authoritatively, and from a single point of view." – joriki May 8 '13 at 3:13

According to WorldCat, the 1323 manuscript of the Summa Logicae is held at the Vatican Library, whilst a microfilm of that manuscript is held by the Saint Louis University library system; WorldCat doesn't bring up anything else for the 1323 manuscript (though Saint Louis University also seems to have microfilms of a number of other 14th century manuscripts of the Summa Logicae), and no facsimiles of the 1488 editio princeps (held at the Bavarian State Library, according to WorldCat).

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thank you very much. I connected with the Vatican Library and was given the material for my research. – Clever Masha May 21 '13 at 2:20

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