Frases Augustus De Morgan

„The work now before the reader is the most extensive which our language contains on the subject.“

—  Augustus De Morgan

Preface, p. iii
The Differential and Integral Calculus (1836)

„I did not hear what you said, but I absolutely disagree with you.“

—  Augustus De Morgan

Attributed to Augustus De Morgan in: August Stern (1994). The Quantum Brain: Theory and Implications. North-Holland/Elsevier. p. 7

„A great many individuals ever since the rise of the mathematical method, have, each for himself, attacked its direct and indirect consequences. …I shall call each of these persons a paradoxer, and his system a paradox.“

—  Augustus De Morgan

I use the word in the old sense: ...something which is apart from general opinion, either in subject-matter, method, or conclusion. ...Thus in the sixteenth century many spoke of the earth's motion as the paradox of Copernicus, who held the ingenuity of that theory in very high esteem, and some, I think, who even inclined towards it. In the seventeenth century, the depravation of meaning took place... Phillips says paradox is "a thing which seemeth strange"—here is the old meaning...—"and absurd, and is contrary to common opinion," which is an addition due to his own time.
A Budget of Paradoxes (1872)

„Experience has convinced me that the proper way of teaching is to bring together that which is simple from all quarters, and, if I may use such a phrase, to draw upon the surface of the subject a proper mean between the line of closest connexion and the line of easiest deduction.“

—  Augustus De Morgan

This was the method followed by Euclid, who, fortunately for us, never dreamed of a geometry of triangles, as distinguished from a geometry of circles, or a separate application of the arithmetics of addition and subtraction; but made one help out the other as he best could.
The Differential and Integral Calculus (1836)

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