The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)
Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 154
minus or mmus (B.2.pr. 6). FIGURE II.If ■•■ do not pafs through the centre, draw FIGURE n. and Tl len X minus (B. 2. pr. 6), that is. … mmus.2 (B. 3.pr. 18).Q. E. D. 122 BOOK in. PROP. XXXVII. THEOR.
Euclid's Elements · Geometry
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