When the parameters are real, the hypergeometric equation defines a Schwarz triangle. We study a combinatorial-topological property of the Schwarz triangle when the three angles are not necessarily less than π.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-bc69-0-20,
author = {Masaaki Yoshida},
title = {A naive-topological study of the contiguity relations for hypergeometric functions},
journal = {Banach Center Publications},
volume = {68},
year = {2005},
pages = {257-268},
zbl = {1107.33002},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc69-0-20}
}
Masaaki Yoshida. A naive-topological study of the contiguity relations for hypergeometric functions. Banach Center Publications, Tome 68 (2005) pp. 257-268. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc69-0-20/