can someone help me with the math behind pp's preflop?

[binions]

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Use the 5/10 rule. If you have to call less than 5% of the effective stacks (the lower stack between you and the raiser), then call.

If you have to call more than 10% of the effective stacks, then fold.

If you have to call between 5% and 10% of the effective stacks, then use your judgement based on your position, your image, and your understanding of the likelihood that the raiser will stack off to you if you flop your set. Sometimes you should fold. Sometimes you should call.

[/ QUOTE ]

Many disagree with the 5-10 rule. I believe Flynn and Mehta prefer a 3-8 rule.