In the papers [KW2, KW3] we introduced and studied a new type of the Selberg zeta function called by a higher Selberg zeta function. We have established the analytic properties, especially the functional equation of the higher Selberg zeta functions in [KW3]. Motivated by this study of higher Selberg zeta functions we formulate the problem for general zeta functions which have the Euler products and discuss their general features.
|Number of pages||5|
|Journal||Proceedings of the Japan Academy Series A: Mathematical Sciences|
|Publication status||Published - Jan 1 2002|
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