Basel, Universitätsbibliothek, O.II.3 Century 10 Language Latin Material Membr. Format 2 gr. Height × width 302 x 251 No. of leaves 12 Numbering ff. No. of columns 2 Lineation pricked, 45 lines Ink brown for the text, orange for the margins and some of the numerals Printed catalogs B.B. Hughes, Medieval Mathematical Latin Writings in the University Library Basel (1972) 45-6 #35.0 Other notes Perhaps the oldest mathematical codex in the Basel Library Source Hughes (1972) Type of source cat. Source’s source insp. Work 1Author standard Victorius Aquitanius Title (standard) (1r) Liber calculi Incipit (1va) Incipit praefatio de ratione calculi. Unitas illa unde omnis numerorum multitudo procedit Subject 1 Mathematics Printed copies Migne, Patrologiae Cursus Completus, series latina 90 (...) 677-80; (crit. ed.) Friedlein, "Der Calculus des Victorius", Zeitschrift für Mathematik u. Physik 16 (1871) 42-79 Item no. 35.1 Folio no. 1r-10ra Explicit (10ra) sic isto modo per omnia crescante numero intellectus aperit. T & K TK 1601 (this ms not mentioned) Additional information N. Bubnov, Gerberti Opera Mathematica (1963) xx; Kinkelin, <"...">, Verh. d. Natf. Gesell. z. Basel (1868) 13; F. Müller, Zeittafeln ... (1892) 40; Sarton 409-10 Work 2Author standard Victorius Aquitanius Title (standard) Tractatus de geometria Incipit (10va) De geometria nunc loquitur. Digitus habet Subject 1 Mathematics Item no. 35.2 Folio no. 10va-b Explicit (10vb) LX librae atticae talentum. Additional information see 35.1