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Principia Mathematica
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===Part V Series. Volume II β±200 to β±234 and volume III β±250 to β±276=== This covers series, which is PM's term for what is now called a totally ordered set. In particular it covers complete series, continuous functions between series with the order topology (though of course they do not use this terminology), well-ordered series, and series without "gaps" (those with a member strictly between any two given members).
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