单词	Banach algebra
释义	Banach algebra noun Ba·​nach algebra ˈbä-ˌnäk-, -nək-, -ˌnäḵ-, -nəḵ- : a linear algebra over the field of real or complex numbers that is also a Banach space for which the norm of the product of x and y is less than or equal to the product of the norm of x and the norm of y for all x and y belonging to it Word History Etymology after Stefan Banach †1945 Polish mathematician First Known Use 1944, in the meaning defined above
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