The classical theorists resemble Euclidean geometers in a non-Euclidean world who, discovering — John Maynard Keynes
The once-surprising existence of non-Euclidean models of Euclid’s first four axioms can — John Allen Paulos
…the differential element of non-Euclidean spaces is Euclidean. This fact, however, is — Hans Reichenbach
It [ non-Euclidean geometry ] would be ranked among the most famous achievements of — Ivor Grattan-Guinness
I have in later years taken to euclid, whitehead, bertrand russell, in an elemental way. — Carl Sandburg