Artist Spotlight: Robert Bosch: Opt-emoji Ghost

Abstract

[1] Barry, P. (2001). Mathematics without words III. Coll. Math. J. 32: 69. [2] Bockstaele, P. (1992). Adrianus Romanus and the trigonometric tables of Georg Joachinm Rheticus. In: Amphora: Festschrift für Hans Wussing zu seinem 65. Geburtstag. Basel/Boston/Berlin: Birkhäuser, pp. 55–66. [3] Bressieu, M. (1581). Metrices astronomic libri quatuor: Haec maximam partem nova est rerum astronomicarum & geographicarum per plana sphericàque triangula dimensionis ratio, veterique impendio expeditor & compendiosior, apud Aegidium Gorbinum, Parisiis, pp. 39–40. [4] Briggs, H. (1633). Trigonometria Britannica, sive de doctrina triangulorum libri duo, Excudebat Petrus Rammasenius, Goud, pp. 50–52, 56. [5] Fincke, T. (1583). Geometriæ rotundi libri XIIII, per Sebastianum Henricpetri, Basileae, pp. 77–78. [6] Hutton, C. (1811). Mathematical Tables: Containing the Common, Hyperbolic, and Logistic Logarithms; Also Sines, Tangents, Secants, & Versed-sines Both Natural and Logarithmic. Together with Several Other Tables Useful in Mathematical Calculations. To which is Prefixed a Large and Original History of the Discoveries and Writings Relating to Those Subjects; with the Complete Description and Use of the Tables. London: F. C. and Rivington, pp. 1–20. [7] Nelsen, R. B. (1989). Double-angle formulas. Coll. Math. J. 20(1): 1. [8] Nelsen, R. B. (2015). Proof without words: a trigonometric identity for sec x + tan x. Math. Mag. 88: 151. [9] Otho, V., Rheticus, G. (1596). Opus palatinum de triangulis, Neostadii in Palatinatu: Excudebat Matthus Harnisius, Heidelberg. [10] Ritter, F. (1895). François Viète, inventeur de l’algebre moderne, 1540-1603, notice sur sa vie et son oeuvre, au Dépot de la Revue occidentale, Paris, p. 49. [11] Walker, R. J. (1942). Half-angle formulas, Amer. Math. Monthly. 49(5): 325.