Abel's theorem and the allied theory, including the theory of the theta functions (1897)
Baker, H. F. (Henry Frederick), 1866-1956 · Cambridge : University Press · leaf 586
¥10. 14. For the transformation D the only change introduced is that given by [&),.,i] = co,.,i — <y,-,2, [«<•, 2] = fw)-,2 - f»M> and this is effected by drawing the loops [aj, [a.,], so that a circuit of 337] OF PERIOD LOOPS. 561 [«i] is equivalent to a circuit of the (original) loop… … Fig. 15. For instance the new loop [a^] in this diagram (Fig. 15) is a deformation of a loopwhich may be drawn as here (Fig. 16);
Geometry, Algebraic · Functions, Theta
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