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References to 'perfect group'
1. axiom of determinacy by CWoo
2. Babylonian method of computing square roots by rspuzio
3. binary Golay code by mathcam
4. descending series by yark
5. game-theoretical quantifier by Henry
6. multiply perfect number by CompositeFan
7. perfect code by mathcam
8. Poincar\'e dodecahedral space by Mathprof
9. Redmond-Sun conjecture by PrimeFan
10. table of continued fractions of $\sqrt{n}$ for $1 < n < 102$ by PrimeFan
11. The Best Score in the Worst Case of a Memory Game is 2N - 1 by ubershmekel
12. theorems of special linear group over a finite field by Daume
13. top ten coolest numbers by rspuzio
14. transfinite derived series by yark
15. United States of America Mathematical Olympiad by PrimeFan