Re: Exercise 2.1
Yes, when there is no break point, the theorem says that for all N. So the theorem is trivially verified.
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Re: Exercise 2.1
I don't understand why the breaking point inequality holds for the positive rays or positive intervals .
For instance, it seems to me that no set of 3 real points can be shattered by a positive ray, since at least always the [cross, circle, cross] dichotomy cannot be achieved, no matter how large is, so would be a breaking point and , which is obviously not true for since the real growth function is . I understand that to be a breaking point, we need that no set of size k can be shattered, am I failing to imagine such set or did I misunderstand some of the definition? 
Re: Exercise 2.1
For N > 7 you need your growth function to be less than 2^N, not 2^3.

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