History
The conceptual step of writing a differential operator as something free-standing is attributed to Louis François Antoine Arbogast in 1800.
Read more about this topic: Differential Operator
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“Modern Western thought will pass into history and be incorporated in it, will have its influence and its place, just as our body will pass into the composition of grass, of sheep, of cutlets, and of men. We do not like that kind of immortality, but what is to be done about it?”
—Alexander Herzen (1812–1870)
“The history of every country begins in the heart of a man or a woman.”
—Willa Cather (1876–1947)
“Anyone who is practically acquainted with scientific work is aware that those who refuse to go beyond fact rarely get as far as fact; and anyone who has studied the history of science knows that almost every great step therein has been made by the “anticipation of Nature.””
—Thomas Henry Huxley (1825–95)