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Dec 18, 2011 at 10:02 vote accept Marc Palm
Dec 18, 2011 at 10:02 comment added Marc Palm My copy of Mc Donalds (1979) has it on pg. 162! Thanks to both of you.
Dec 17, 2011 at 18:05 comment added GH from MO This is very useful, thank you. I will delete my response as obsolete. The final answer is (2.9) on p.298 of Macdonald's book.
Dec 17, 2011 at 17:17 history answered Paul Broussous CC BY-SA 3.0