We know that mathematicians care no more for logic than logicians for mathematics. The two eyes of science are mathematics and logic; the mathematica….

During the last two centuries and a half, physical knowledge has been gradually made to rest upon a basis which it had not before. It has become math….

The Astronomer's Drinking Song Astronomers! What can avail Those who calumniate us; Experiment can never fail With such an apparatus..

As to writing another book on geometry [to replace Euclid] the middle ages would have as soon thought of composing another New Testament..

I am perfectly convinced that I have both seen, and heard in a manner which should make unbelief impossible, things called spiritual which cannot be ….

Mathematicians care no more for logic than logicians for mathematics..

I was x years old in the year x2..

The moving power of mathematical invention is not reasoning but imagination..

Wrong hypotheses, rightly worked from, have produced more useful results than unguided observations..

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

Lagrange, in one of the later years of his life, imagined that he had overcome the difficulty (of the parallel axiom). He went so far as to write a p….

It should seem that it is easier to square the circle than to get round a mathematician..

Imagine a person with a gift of ridicule [He might say] First that a negative quantity has no logarithm; secondly that a negative quantity has no squ….

Considerable obstacles generally present themselves to the beginner, in studying the elements of Solid Geometry, from the practice which has hitherto….

Common integration is only the memory of differentiation..

The imaginary expression √(-a) and the negative expression -b, have this resemblance, that either of them occurring as the solution of a problem indi….

Every science that has thriven has thriven upon its own symbols: logic, the only science which is admitted to have made no improvements in century af….

Great fleas have little fleas upon their backs to bite 'em, And little fleas have lesser fleas, and so ad infinitum, And the great fleas themselves, ….

I end with a word on the new symbols which I have employed. Most writers on logic strongly object to all symbols. ... I should advise the reader not ….

[About Francis Baily] The history of the astronomy of the nineteenth century will be incomplete without a catalogue of his labours. He was one of the….

Isaac Newton was born at Woolsthorpe, near Grantham, in Lincolnshire, on Christmas Day, 1642: a weakly and diminutive infant, of whom it is related t….