TY - JOUR

T1 - An elementary counterexample to the open mapping principle for bilinear maps

AU - Horowitz, Charles

PY - 1975/12

Y1 - 1975/12

N2 - In 1.2], Rudin asked whether a continuous bilinear map from the product of two Banach spaces onto a Banach space must be open at the origin; i.e., whether under such a map the image of every neighborhood of zero must contain a neighborhood of zero. Recently, Cohen ll] showed that the answer to the general question was in the negative. However, his counterexample was somewhat involved and left the issue unresolved for bilinear maps on Hilbert spaces. The purpose of this note is to show that the open mapping principle for bilinear maps, as described above, fails even in the finite dimensional case.

AB - In 1.2], Rudin asked whether a continuous bilinear map from the product of two Banach spaces onto a Banach space must be open at the origin; i.e., whether under such a map the image of every neighborhood of zero must contain a neighborhood of zero. Recently, Cohen ll] showed that the answer to the general question was in the negative. However, his counterexample was somewhat involved and left the issue unresolved for bilinear maps on Hilbert spaces. The purpose of this note is to show that the open mapping principle for bilinear maps, as described above, fails even in the finite dimensional case.

UR - http://www.scopus.com/inward/record.url?scp=84966248326&partnerID=8YFLogxK

U2 - 10.1090/S0002-9939-1975-0419813-0

DO - 10.1090/S0002-9939-1975-0419813-0

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AN - SCOPUS:84966248326

SN - 0002-9939

VL - 53

SP - 293

EP - 294

JO - Proceedings of the American Mathematical Society

JF - Proceedings of the American Mathematical Society

IS - 2

ER -