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    Sachs, Robert L.

    The College mathematics journal, 03/2022, Volume: 53, Issue: 2
    Journal Article

    The key techniques in a traditional first course in differential equations are linked by reexpressing them in terms of differential operators and change-of-basis ideas, including integrating factors, variation of parameters, and the method of undetermined coefficients. The main tool is to convert linear operators from sums to compositions.