Cajori, Florian (1993 (1ª Ed. 1928)). «§ 184, § 359, § 368». A History of Mathematical Notations - Notations in Elementary Mathematics1 (two volumes in one unaltered reprint edición). Chicago, US: Open court publishing company. pp. 193, 402–403, 411–412. ISBN0-486-67766-4. LCCN93029211. Consultado el 22 de julio de 2019. «§359. […] ∥ for parallel occurs in Oughtred's Opuscula mathematica hactenus inedita (1677) [p. 197], a posthumous work (§ 184) […] §368. Signs for parallel lines. […] when Recorde's sign of equality won its way upon the Continent, vertical lines came to be used for parallelism. We find ∥ for "parallel" in Kersey,[14] Caswell, Jones,[15] Wilson,[16] Emerson,[17] Kambly,[18] and the writers of the last fifty years who have been already quoted in connection with other pictographs. Before about 1875 it does not occur as often […] Hall and Stevens[1] use "par[1] or ∥" for parallel […] [14] John Kersey, Algebra (London, 1673), Book IV, p. 177. [15] W. Jones, Synopsis palmarioum matheseos (London, 1706). [16] John Wilson, Trigonometry (Edinburgh, 1714), characters explained. [17] W. Emerson, Elements of Geometry (London, 1763), p. 4. [18] Ludwig Kambly, Die Elementar-Mathematik, Part 2: Planimetrie, 43. edition (Breslau, 1876), p. 8. […] [1] H. S. Hall and F. H. Stevens, Euclid's Elements, Parts I and II (London, 1889), p. 10. […]».[1]
Cajori, Florian (1993 (1ª Ed. 1928)). «§ 184, § 359, § 368». A History of Mathematical Notations - Notations in Elementary Mathematics1 (two volumes in one unaltered reprint edición). Chicago, US: Open court publishing company. pp. 193, 402–403, 411–412. ISBN0-486-67766-4. LCCN93029211. Consultado el 22 de julio de 2019. «§359. […] ∥ for parallel occurs in Oughtred's Opuscula mathematica hactenus inedita (1677) [p. 197], a posthumous work (§ 184) […] §368. Signs for parallel lines. […] when Recorde's sign of equality won its way upon the Continent, vertical lines came to be used for parallelism. We find ∥ for "parallel" in Kersey,[14] Caswell, Jones,[15] Wilson,[16] Emerson,[17] Kambly,[18] and the writers of the last fifty years who have been already quoted in connection with other pictographs. Before about 1875 it does not occur as often […] Hall and Stevens[1] use "par[1] or ∥" for parallel […] [14] John Kersey, Algebra (London, 1673), Book IV, p. 177. [15] W. Jones, Synopsis palmarioum matheseos (London, 1706). [16] John Wilson, Trigonometry (Edinburgh, 1714), characters explained. [17] W. Emerson, Elements of Geometry (London, 1763), p. 4. [18] Ludwig Kambly, Die Elementar-Mathematik, Part 2: Planimetrie, 43. edition (Breslau, 1876), p. 8. […] [1] H. S. Hall and F. H. Stevens, Euclid's Elements, Parts I and II (London, 1889), p. 10. […]».[1]
Cajori, Florian (1993 (1ª Ed. 1928)). «§ 184, § 359, § 368». A History of Mathematical Notations - Notations in Elementary Mathematics1 (two volumes in one unaltered reprint edición). Chicago, US: Open court publishing company. pp. 193, 402–403, 411–412. ISBN0-486-67766-4. LCCN93029211. Consultado el 22 de julio de 2019. «§359. […] ∥ for parallel occurs in Oughtred's Opuscula mathematica hactenus inedita (1677) [p. 197], a posthumous work (§ 184) […] §368. Signs for parallel lines. […] when Recorde's sign of equality won its way upon the Continent, vertical lines came to be used for parallelism. We find ∥ for "parallel" in Kersey,[14] Caswell, Jones,[15] Wilson,[16] Emerson,[17] Kambly,[18] and the writers of the last fifty years who have been already quoted in connection with other pictographs. Before about 1875 it does not occur as often […] Hall and Stevens[1] use "par[1] or ∥" for parallel […] [14] John Kersey, Algebra (London, 1673), Book IV, p. 177. [15] W. Jones, Synopsis palmarioum matheseos (London, 1706). [16] John Wilson, Trigonometry (Edinburgh, 1714), characters explained. [17] W. Emerson, Elements of Geometry (London, 1763), p. 4. [18] Ludwig Kambly, Die Elementar-Mathematik, Part 2: Planimetrie, 43. edition (Breslau, 1876), p. 8. […] [1] H. S. Hall and F. H. Stevens, Euclid's Elements, Parts I and II (London, 1889), p. 10. […]».[1]
