In the late 1930's the Department of Scientific and Industrial Research tried to interest pure mathematicians in nonlinear differential equations which were important for radio engineers and scientists because they described the behaviour of electric circuits.
Sa late 1930's ang Kagawaran ng Siyentipiko at Industrial Research tried sa interes purong mathematicians sa kaugalian nonlinear equation na kung saan ay mahalaga para sa radyo mga inhinyero at siyentipiko dahil sila ay inilarawan ng pag-uugali ng electric circuits.