Talk:Ihara zeta function
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It would be very helpful to have, at a minimum, Ihara's full name, his dates, and the year that this zeta function was introduced.
- Done, methinks Sodin 19:58, 17 March 2007 (UTC)
cycle space
[edit]I believe the correct definition should be that the product is over all elements of the cycle space. We do not have an article for a prime walk. Calling this a "prime walk" seems misleading since primes are always a base or a generating set for something, whereas the product in the ihara zeta is not over just a generating set, but over all cycles in the cycle space, right? Also, the current definition in the article seems to place special importance on "no backtracking", but I think this would be automatically taken care of by restricting to simple graphs, (i.e. only one edge per pair of verticies), and then restricting to cycle space. Right?
Hmm. on the other hand, I am reading an article that does call these things prime cycles, so this seems to be common usage, even though they aren't 'prime' in the sense of cycle space. On the other hand the product rep of riemann zeta is over prime numbers so I guess that's ok. linas (talk) 00:06, 8 September 2008 (UTC)
Ok this is hilarious
[edit]Can it be that since 2004 nobody noticed that the one thing this article is missing is the definition of Ihara's zeta function:
![{\displaystyle \zeta _{G}\left(u\right)=\prod _{\left[p\right]}{\frac {1}{1-u^{\mathrm {len} (p)}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4e33146fd9df137ae0e1c4bd43c4ea8ccb0be716)
It seems that the author meant to write this, because the article does say "The product in the definition of the Ihara zeta function is taken over all prime closed geodesics p", but the definition itself is missing... — Preceding unsigned comment added by 185.120.126.58 (talk) 18:44, 15 July 2020 (UTC)