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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

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On operator ranges in Hilbert & Banach spaces

In Embry's 1973 and Douglas' 1966 papers the Hilbert space condition $AA^* < \lambda^2 BB^*$ about the adjoints is replaced by the following equivalent Banach type of condition: $\|A\| < \lambda \|B\| …
nir cohen's user avatar