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Jun 25, 2017 at 10:18 comment added Ben Barber A strengthening of this argument, where you choose a large acyclic set greedily, gives $n/(T+1)$, which is the roughly $n/T$ mentioned in the question.
Jun 25, 2017 at 10:13 comment added Fedor Petrov this does not use the property that girth exceeds 2
Jun 25, 2017 at 10:10 history answered Victor CC BY-SA 3.0