Kato's conjecture
From Infogalactic: the planetary knowledge core
Kato's conjecture is a mathematical problem named after mathematician Tosio Kato, of the University of California, Berkeley. Kato initially posed the problem in 1953.[1]
Kato asked whether the square root of certain elliptic operators, defined via functional calculus, are analytic.
The problem remained unresolved for nearly a half-century, until it was jointly solved in 2001 by Pascal Auscher, Steve Hofmann, Michael Lacey, Alan McIntosh, and Philippe Tchamitchian.[2]
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