Sigma functions for telescopic curves. (English) Zbl 1328.14057

The author constructs sigma functions explicitly for a class of algebraic curves. Let \(C\) be a compact Riemann surface of genus \(g\). In order to express defining equations of \(C\), he uses a canonical form for expressing non-singular algebraic curves introduced by S. Miura [“Linear codes on affine algebraic curves”, IEICE Trans. J81-A, 1398–1421 (1998)]. Given a finite sequence \((a_{1},\dots, a_{t})\) of positive integers whose greatest common divisor is equal to one, Miura introduced a non-singular algebraic determined by the sequence \((a_{1},\dots, a_{t})\). The idea is to express a non-singular algebraic curve by affine equations of \(t\) variables whose orders at infinity are \((a_{1},\dots, a_{t})\).
F. Klein [Math. Ann. 32, 351–380 (1888; JFM 20.0491.01)] extended the elliptic sigma functions to the case of hyperelliptic curves of genus \(g\), which are expressed in the Miura canonical form with \(t = 2, a_{1} = 2\), and \(a_{2} = 2g + 1\). V. M. Bukhshtaber, D. V. Leikin, V. Z. Enol’skii [Russ. Math. Surv. 54, No. 3, 628–629 (1999); translation from Usp. Mat. Nauk 54, No. 3, 155–156 (1999; Zbl 1081.14519)] and A. Nakayashiki [Asian J. Math. 14, No. 2, 175–212 (2010; Zbl 1214.14028)] extended Klein’s sigma functions to the case of more general plane algebraic curve called \((n, s)-\)curves, which are expressed in the Miura canonical form with \(t = 2, a_{1} = n,\) and \(a_{2} = s\).
In this paper author consider a symplectic basis of the first cohomology group and give an explicit construction of sigma functions for telescopic curves, i.e., the curves such that the number of defining equations is exactly \(t - 1\) in the Miura canonical form. The telescopic curves contain the \((n, s)-\)curves as special cases.


14H55 Riemann surfaces; Weierstrass points; gap sequences
14H42 Theta functions and curves; Schottky problem
14H50 Plane and space curves
Full Text: arXiv Euclid


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