1.4 Linear equations and the integrating factor (source code)

= 1.4 Linear equations and the integrating factor
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Online text: https://www.jirka.org/diffyqs/html/intfactor_section.html

Cited passages: Notes on Diffy Qs, §1.4 Linear equations and the integrating factor: product derivative, formula (1.4), and Remark 1.4.1 on existence throughout a coefficient-continuity interval.