Excerpt from A Treatise on the Differential Calculus: With Numerous Examples
The present edition has been carefully revised and some; what enlarged. I have examined with attention and interest treatises on the Differential Calculus recently published by eminent mathematicians, in order to discover if the methods of explaining and developing the principles of the subject had gained any real improvement during the last twenty years. I have not however found reason for concluding that I could with advantage make any essential change in this elementary work.
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Alexander Keith Johnston was a geographer and cartographer. He was elected a Fellow of the Royal Society of Edinburgh in 1849 and was a founding member of the Meteorological Society of Scotland.