Mathematics is the art of giving the same name to different things.

A reality completely independent of the spirit that conceives it, sees it, or feels it, is an impossibility. A world so external as that, even if it existed, would be forever inaccessible to us.

Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.

Deviner avant de démontrer! Ai-je besoin de rappeler que c'est ainsi que se sont faites toutes les découvertes importantes.

Point set topology is a disease from which the human race will soon recover.

Experiment is the sole source of truth.

Why is it that showers and even storms seem to come by chance, so that many people think it quite natural to pray for rain or fine weather, though they would consider it ridiculous to ask for an eclipse by prayer.