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I'm looking for a package where is defined the symbol for polynomial-time reduction that looks like the infinity symbol.

Thanks!

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    Could you please describe the symbol in more detail. How does it differ from \infty? Also, have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol. – Caramdir Jan 6 '11 at 19:50
  • Sipser uses \le_P for a polynomial time reduction. For example, Theorem 7.25 (in the first edition), "If $A\le_P B$ and $B\in P$, then $A\in P$." – TH. Jan 6 '11 at 20:09
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Do you mean \propto? I think I've seen that for polynomial-time reduction before...

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