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I am finding an example, which is neither thick set nor syndetic set but piecewise syndetic set. After too many many trials I got nothing. Can you help me to find this example? Thank you.

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  • $\begingroup$ Please define "example" (of what?), "thick" and the unusual word "syndetic". $\endgroup$ – Dr. Lutz Lehmann Dec 2 at 9:22

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