POKER INFO - PROILE - Gus Hansen

In the daniel negreanu evaluation of Gus's playing he says that gus plays a very mathematical game.Alot of these top players are always been talked about as being very good at maths.I dont understand...what exactly are they calculating?...1st of all I am doing a Masters in Maths so Im not "completely" without a clue.I understand the claculating of "pot odds" which is straight forward.I understand the implied odds too.But these calculations are hardly rocket science...and alot of the probabilities for holdings(such as a set turning into a boat or quads on turn/river etc)can be memorised if you play often.I understand when players say "there is alot of power in the pot" and that it is matematically correct to draw to it. What im trying to say...are what else is there to mathematically calculate apart from the basic's...you hardly have to have a math whizz to do.I'd love to hear a step by step play as to what math calculations go through Gus/barry/ungar when making a play/call???Can anyone help with this??