ABSTRACT
Generally speaking, it is very difficult to solve first order differential equations. Even the apparently simple equation d y d x = f ( x , y ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315371825/895247ed-bf4c-467d-b370-ced59759b8c3/content/eq240.tif"/>
