Fourier Series Tolstov Book Question

  1. I'm currently reading Tolstov's Fourier series and in page 58 he talks about a criterion for the completeness of a system. I've attached the pages where he talks about it. In general, I don't get how he came up with this; specifically, why does he use those limits of [itex]\epsilon[/itex] and [itex]\epsilon[/itex]/4?

    -Thank you

    Attached Files:

  2. jcsd
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