/src/main/java/net/finmath/equities/models/Black76Model.java
final Double[] deriv = sigma.apply( BlackFunctionDerivatives) ;
final Double[] deriv = BlackFunctionDerivatives.apply ( sigma ) ;
impliedSdev = HouseholderStep.apply(impliedSdev); } else { final Function<Double, Double> HouseholderStep = sigma -> { <extra_id_0> final double b0 = deriv[0]; final double b1 = deriv[1]; final double b2 = deriv[2]; final double b3 = deriv[3]; final double bmaxb0 = bMax - b0; final double nu = bmaxb0 * Math.log(bmaxb0 / (bMax - beta)) / b1;