Abstract
AbstractWe construct a weight 1/2 multiplier system for the group $$\Gamma _0^+(p)$$
Γ
0
+
(
p
)
, the normalizer of the congruence subgroup $$\Gamma _0(p)$$
Γ
0
(
p
)
where p is an odd prime, and we define an analogue of the eta function and Rademacher symbol and relate it to the geometry of edge paths in a triangulation of the upper half-plane.
Publisher
Springer Science and Business Media LLC