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On the vanishing of coefficients of the powers of a theta function
The Ramanujan Journal ( IF 0.6 ) Pub Date : 2021-02-13 , DOI: 10.1007/s11139-020-00366-8
Jacques Sauloy , Changgui Zhang

A result on the Galois theory of q-difference equations (Sauloy in Théorie analytique locale des équations aux q-différences de pentes arbitraires. See arXiv:2006.03237v1, 2020) leads to the following question: If \(q \in {{\mathbf {C}}^*}\), \(\left| q \right| < 1\) and if one sets \({\theta _q}(z) := \sum \nolimits _{m \in {{\mathbf {Z}}}} q^{m(m-1)/2} z^m\), can some coefficients of the Laurent series expansion of \(\theta _q^k(z)\), \(k \in {{\mathbf {N}}}^*\), vanish ? We give a partial answer.



中文翻译:

关于theta函数的幂系数的消失

在伽罗瓦理论的结果q -difference方程(Sauloy在Théorieanalytique区域DES方程AUX q如果:导致以下问题:2006.03237v1年,2020年-différences德pentes arbitraires见的arXiv)在\(Q \ {{\ mathbf {C}} ^ *} \)\(\ left | q \ right | <1 \)和如果一组\({\ theta _q}(z):= \ sum \ nolimits _ {m \ in { {\ mathbf {Z}}}} q ^ {m(m-1)/ 2} z ^ m \),能否将Laurent级数展开的某些系数\(\ theta _q ^ k(z)\)\ (k \ in {{\\ mathbf {N}}} ^ * \)中,消失了吗?我们给出部分答案。

更新日期:2021-02-15
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