"Ueber gewöhnliche lineare Differentialgleichungen, No.21" by Sophus Lie, originally published in 1885, presents a detailed exploration of ordinary linear differential equations. Written in German, this work offers insights into the mathematical theories and analytical methods prevalent in the late 19th century. It is a valuable resource for mathematicians, historians of science, and anyone interested in the development of differential equations. This treatise provides a glimpse into the intellectual landscape of its time and highlights Lie's significant contributions to the field of mathematics.

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