/src/main/java/net/finmath/fouriermethod/models/BatesModel.java
.add( characteristicFunction.multiply( -1) ).multiply( 0.5).add( c.multiply( lambda[i+1]) ).multiply( 2*sigma[i]*sigma[i])
.add ( iargument.multiply ( -1 ) ) .multiply ( 0.5 ) .add ( c.multiply ( lambda[i+1] ) ) .multiply ( 2*sigma[i]*sigma[i] )
gamma[i] = iargument .multiply(rho[i]*sigma[i]) .subtract(beta[i]) .pow(2) .subtract( iargument.multiply(iargument) <extra_id_0> ) .sqrt() ; a[i] = iargument .multiply(rho[i] * sigma[i])