Asymptotic expansions (1965) was written because Copson was pressed to write a more major work on that subject to expand on a shorter work written in 1943 at the request of the Admiralty.
Asymptotic expansions (1965) ay isinulat dahil Copson ay pipi na magsulat ng isang mas malaking trabaho sa na paksa upang mapalawak sa isang mas maikling trabaho na nakasulat sa 1943 at ang mga kahilingan ng Admiralty.