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The following 2 entries include the term BANACH.
Banach space
noun: a complete normed vector space
Banach algebra
noun: 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
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Merriam-Webster unabridged
