By John C. Oxtoby
During this version, a collection of Supplementary Notes and comments has been extra on the finish, grouped in line with bankruptcy. a few of these name awareness to next advancements, others upload extra clarification or extra comments. lots of the comments are observed via a in short indicated evidence, that's occasionally diversified from the single given within the reference pointed out. The record of references has been extended to incorporate many fresh contributions, however it continues to be no longer meant to be exhaustive. John C. Oxtoby Bryn Mawr, April 1980 Preface to the 1st version This ebook has major topics: the Baire classification theorem as a mode for proving life, and the "duality" among degree and classification. the class approach is illustrated via numerous common purposes, and the analogy among degree and class is explored in all of its ramifications. To this finish, the weather of metric topology are reviewed and the relevant homes of Lebesgue degree are derived. It seems that Lebesgue integration isn't really crucial for current purposes-the Riemann crucial is adequate. thoughts of normal degree thought and topology are brought, yet not only for the sake of generality. remember the fact that, the time period "category" refers regularly to Baire classification; it has not anything to do with the time period because it is utilized in homological algebra.
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