“Abel has left mathematicians enough to keep them busy for 500 years.”
“I turn aside with a shudder of horror from this lamentable plague of functions which have no derivatives.”
“There exists, if I am not mistaken, an entire world which is the totality of mathematical truths, to which we have access only with our mind, just as a world of physical reality exists, the one like the other independent of ourselves, both of divine creation.”
“We are servants rather than masters in mathematics.”
