Grundzüge der Mengenlehre

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Grundzüge der Mengenlehre (German for "Basics of Set Theory") is an influential book on set theory written by Felix Hausdorff.

First published in April 1914, Grundzüge der Mengenlehre was the first comprehensive introduction to set theory. Besides the systematic treatment of known results in set theory, the book also contains chapters on measure theory and topology, which were then still considered parts of set theory. Hausdorff presented and developed original material which was later to become the basis for those areas.