Differential Equations by William Woolsey Johnson
Publisher: J. Wiley 1906
ISBN/ASIN: B007SPAUEQ
Number of pages: 96
The differential equation must necessarily at first be viewed in connection with a 'primitive', from which it might have been obtained by the direct process, and the solution consists in the discovery, by tentative and more or less artificial methods, of such a primitive, when it exists.
Mathematics Analysis & Calculus Differential Equations