Principles of Differential Equations, , Wiley, Nelson G. Markley,Differential calculus and equations,Calculus and mathematical analysis, accessible; scientific; practical; knowledge; differential; keystone; field; equations; today; introduction; principles; broad; mathematics; applications; fields; concepts; basic; definitive; different subfields; order,, Pure and Applied Mathematics: A Wiley Series of Texts, Monographs and Tracts, United States, en-UShttps://www.wiley.comaccessible; scientific; practical; knowledge; differential; keystone; field; equations; today; introduction; principles; broad; mathematics; applications; fields; concepts; basic; definitive; different subfields; order, [BLURB],[CITY],,books, ebooks, biblet, Book2look