Sad news, such an original individual and truly a giant of Mathematics. To imagine he invented Lebesgue measure theory on his own in his late teens. I remember

Sad news, such an original individual and truly a giant of Mathematics. To imagine he invented Lebesgue measure theory on his own in his late teens. I remember reading that when he was sent to study under Schwartz and Dieudonne in Nancy (if i remember correctly), he solved the equivalent of seven phd thesis problems in nine months. His work with radical ecology is also highlighted in the article.