, Volume 70, Issue 1, pp 57-65

Strictly singular operators and isomorphisms of Cartesian products of power series spaces

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V. P. Zahariuta, in 1973, used the theory of Fredholm operators to develop a method to classify Cartesian products of locally convex spaces. In this work we modify his method to study the isomorphic classification of Cartesian products of the kind $ E_0^p(a)\times E_\infty ^q(b) $ where $1 \leq p,q \le \infty, p \neq q, a = (a_n)_{n=1}^\infty $ and $ b = (b_n)_{n=1}^\infty $ are sequences of positive numbers and $ E_0^p(a), E_\infty ^q (b) $ are respectively $ \ell ^p $ -finite and $ \ell ^q $ -infinite type power series spaces.

Received: 18.3.1996; actual version received 16.6.1997.