ABSTRACT
In Chapter II we investigated various properties of the kernel function for second-order equations of the form https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003417019/eed074ff-a22f-4044-8fec-c2ab8430cc1c/content/equ1_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
