# Set theory

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**Set theory** is the branch of mathematical logic that studies sets, which informally are collections of objects.

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## Quotes[edit]

- Henri Poincaré thought the theory of infinite sets a grave malady and pathologic. "Later generations," he said in 1908, "will regard set theory as a disease from which one has recovered.
- Morris Kline (1982).
*Mathematics: The Loss of Certainty*. Oxford University Press. p. 203. ISBN 978-0-19-503085-3.

- Morris Kline (1982).