ABSTRACT
The canonical form of the oscillatory integral describing the cusp diffraction catastrophe defined by () P ( X , Y ) = ∫ − ∞ ∞ exp i ( u 4 + X u 2 + Y u ) d u https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072584/300cbf75-7783-4a6f-9796-7cd4d736d320/content/eq3262.tif"/>
