On the n-Variable Saddle Point and Steepest Descent Methods

The saddle point method is a well-known technique used to obtain the large λ behaviour of integrals of the form (1) I ( λ ) = ∫ γ f ( z ) e λ S ( z ) d z . https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072584/300cbf75-7783-4a6f-9796-7cd4d736d320/content/eq3153.tif"/>