Città del Vaticano, O, Cod. 2069 Century 14 Language Latin Material Chart. No. of columns 2 cols. Printed catalogs John F. Daly, Charles J. Ermatinger, "Mathematics in the Codices Ottoboniani Latini", Manuscripta 9 (1965), 20-1 Source Daly, Ermatinger Type of source cat. Source’s source insp. Work 1Author standard Jordanus Nemorarius Title (standard) Arithmetica Incipit Unitas est esse rei per se discretio. (N)umerus est quantitas discretorum collectiva ... Item no. 1 Folio no. 1r-51v Explicit ... sicque habebimus inter H et M quorum proportio est minor vel non maior data proportione medios N secundum armonicam et K secundum geometricam et L secundum musicam. Et hoch est quod ostendi debuit. Colophon (At bottom of 51v in a contemporary hand:) Explicit distinctio decima et cum ea finitur liber iordani de elementis arsmetice (sic) CCCC & XVII propositiones continens. Additional copies Cod. Vat. lat. 4455, 105ra-137va T & K TK 1600 Additional information The copy Vat. lat. 4455 ends with an attribution of the work to Jordanus in terms identical with those registered in the explicit above. In the present copy each proposition precedes the related proof; in Vat. lat. 4455 the order of propositions and proofs seems to be consistently reversed. Work 2Author standard Boethius Title (standard) De institutione arithmetica Incipit Domino patri suo Simacho Boetius. In dandis accipiendisque muneribus ita recte officia inter eos precipue qui sese magnifaciunt ... Item no. 2 Folio no. 52r-81v Explicit ... huius autem descriptionis subter exemplar adiecimus. Tables Throughout the text, blank spaces were left for the explanatory tables, wich were not added T & K TK 466, 669, 768
