4

4

proper, is like the sword that our warriors by sea and land
carry at their sides. Having it there at hand marks the
mathematician as the sword marks his officer. Moreover
it is like a sword a most handy instrument. There is a traditional
use of the calculus just as there is a traditional sword
practice. But just as swords are as far as practical use,
goes are more to the purpose in opening tomato cans
than men's abdomens, so the calculus is put by
real mathematicians to uses its inventor little dreamed of.
And if this is true of the differential calculus, it is a hundred
times true of any logical calculus.

Professor Dedekind, one of the leading logico-mathematicians,--
but like the rest, a l mathematician
in fact, and not a logician,--urges that mathematics
is nothing but a particular branch of logic.