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References to 'perfect set'
1. Achilles number by PrimeFan
2. Cantor space by mathcam
3. Cantor-Bendixson derivative by CWoo
4. Cantor-Bendixson theorem by CWoo
5. dense in-itself by rspuzio
6. determination of even abundant numbers with one odd prime factor by rspuzio
7. nonempty perfect subset of $\mathbb{R}$ that contains no rational number, a by Gorkem
8. scattered space by CWoo
9. sinc function by mathcam
10. table of continued fractions of $\sqrt{n}$ for $1 < n < 102$ by PrimeFan
11. temporary index 3 of number theory topics by PrimeFan