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  "body": "\n## Summary\n\nIn descriptive set theory, a **coanalytic set** is a [[set|0BSJ7RQ9BW]] (typically a subset of a Polish space) that is the [[complement|0RKF1ZT5JJ]] of an analytic set. In the projective hierarchy, coanalytic sets correspond to $\\mathbf{\\Pi}^1_1$ sets.\n",
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