In February, I wrote about Euclid's parallel postulate, the black sheep of the big, happy family of definitions, postulates, and axioms that make up the foundations of Euclidean geometry. I included ...

THIS is a philosophical thesis by a writer who is really familiar with the subject of non-Euclidean geometry, and as such it is well worth reading. The first three chapters are historical; the ...

IN reference to the controversy between Mr. Spencer and his reviewer about Sir I. Newton's calling his laws of motion “axioms,” it is to be observed that there is a certain ambiguity in the word.