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This article is cited in 1 scientific paper (total in 1 paper)
Quasi-elliptic functions
A. Ya. Khrystiyanyn, Dz. V. Lukivska Ivan Franko National University of Lviv,
Universytetska str., 1,
79000, Lviv, Ukraine
Abstract:
We study certain generalizations of elliptic functions, namely quasi-elliptic functions.
Let $p = e^{i\alpha},$ $q = e^{i\beta},$ $\alpha,\, \beta \in \mathbb{R}.$ A meromorphic in $\mathbb{C}$ function $g$ is called quasi-elliptic if there exist $\omega_1, \omega_2 \in \mathbb{C}^{*},$ $\mathrm{Im}
\frac{\omega_2}{\omega_1} > 0,$ such that
$g(u+\omega_1)=pg(u)$, $g(u+\omega_2)=qg(u)$
for each $u\in\mathbb{C}$.
In the case $\alpha = \beta = 0 \mod 2\pi$ this is a classical theory of elliptic functions. A class of quasi-elliptic functions is denoted by $\mathcal{QE}.$ We show that the class $\mathcal{QE}$ is nontrivial. For this class of functions we construct
analogues $\wp_{\alpha \beta}$, $\zeta_{\alpha \beta}$ of $\wp$ and $\zeta$ Weierstrass functions. Moreover, these analogues are in fact the generalizations of the classical $\wp$ and $\zeta$ functions in such a way that the latter can be found among the former by letting $\alpha=0$ and $\beta=0$. We also study an analogue of the Weierstrass $\sigma$ function and establish connections between this function and $\wp_{\alpha \beta}$ as well as $\zeta_{\alpha \beta}$.
Let $q, p \in\mathbb{C}^*,$ $|q|<1.$ A meromorphic in $\mathbb{C^{*}}$ function $f$ is said to be $p$-loxodromic of multiplicator $q$ if for each $z
\in \mathbb{C}^{*}$
$f(qz) = pf(z).$ We obtain telations between quasi-elliptic and $p$-loxodromic functions.
Keywords:
quasi-elliptic function, the Weierstrass $\wp$-function, the Weierstrass $\zeta$-function, the Weierstrass $\sigma$-function,
$p$-loxodromic function.
Received: 27.09.2016
Citation:
A. Ya. Khrystiyanyn, Dz. V. Lukivska, “Quasi-elliptic functions”, Ufa Math. J., 9:4 (2017), 127–134
Linking options:
https://www.mathnet.ru/eng/ufa403https://doi.org/10.13108/2017-9-4-127 https://www.mathnet.ru/eng/ufa/v9/i4/p129
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