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What does $\leq_{\mathrm{P}}$ mean? Is it supposed to mean less than or equal polynomial time?

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It should have been defined wherever you've seen it used. It normally stands for polynomial-time reducibility of one kind or another; usually many-one reducibility.

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  • $\begingroup$ I am using it to show that Directed Hamilton Cycle ≤P Undirected Hamilton Cycle. $\endgroup$ – El Fufu Apr 15 '16 at 3:28
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    $\begingroup$ Yep. So it's whatever version of polynomial-time reducibility you're using in your course. You need to check the definition given by your lecturer. $\endgroup$ – David Richerby Apr 15 '16 at 3:39

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