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The techniques of calculus, powerful and general as they are, apply only to functions that are sufficently "well behaved" (Rogawski 21).
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― Calculus: Early Transcendentals
― Calculus: Early Transcendentals
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Most of his predecessors had considered the differential calculus as bound up with geometry, but Euler made the subject a formal theory of functions which had no need to revert to diagrams or geometrical conceptions.
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― The History of the Calculus and Its Conceptual Development
― The History of the Calculus and Its Conceptual Development
