/src/main/java/net/finmath/equities/models/Black76Model.java
final double b0 = deriv[0] - fRC;
final double b0 = deriv[0] - beta;
} else if (beta <= bTildeUpper) { final Function<Double, Double> HouseholderStep = sigma -> { final Double[] deriv = BlackFunctionDerivatives.apply(sigma); <extra_id_0> final double b1 = deriv[1]; final double b2 = deriv[2]; final double b3 = deriv[3]; final double nu = -b0 / b1; final double gamma = b2; final double delta = b3;