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 Jan 29 accepted About the Feller Condition in Heston Calibration Jan 29 awarded Curious Jan 28 comment About the Feller Condition in Heston Calibration Thanks for the comment @q.t.f. This is the kind of information I'm looking for. Have you read that in an article or do you know it from experience? Can it differ from market to market? I have seen a few articles incorporating the Feller condition as a constraint, and some do not. Jan 28 asked About the Feller Condition in Heston Calibration Sep 23 awarded Necromancer Nov 24 awarded Tumbleweed Nov 18 answered Relation between IV and SD Nov 17 asked FX Delta Conventions Sep 30 awarded Explainer Jul 12 comment Prove that the binomial algorithm implies the arbitrage free price at t=0 of a T-claim Usually you write $E^Q[V_i]$ to denote the expectation under the martingale measure, if it is not clear from the context. Jul 12 comment Prove that the binomial algorithm implies the arbitrage free price at t=0 of a T-claim Yes, exactly! A naive version of total expectation is usually introduced in a first class in probability theory. See Wikipedia for more info, if you're interested: en.wikipedia.org/wiki/Law_of_total_expectation Jul 11 answered Prove that the binomial algorithm implies the arbitrage free price at t=0 of a T-claim Jul 4 answered Which is the correct definition of arbitrage? Jul 4 awarded Commentator Jul 4 comment Inconsistent Definition of Arbitrage in Bjork? @BCLC: Yes, it should be >0. Thanks for pointing that out! Since they are definitions they cannot be right or wrong. However the second one makes more sense, and is the one most commonly used in the literature. Jul 4 revised Inconsistent Definition of Arbitrage in Bjork? edited body Jul 4 comment Inconsistent Definition of Arbitrage in Bjork? @KaapstadKwant: Thanks for pointing out my error! Jul 4 comment Inconsistent Definition of Arbitrage in Bjork? Hello BCLC, I corrected my answer since the first one was incorrect. Jul 4 revised Inconsistent Definition of Arbitrage in Bjork? Corrected an incorrect answer Jul 4 answered Inconsistent Definition of Arbitrage in Bjork?