A complete isomorphic classification is obtained for Köthe spaces such that ; here χ is the characteristic function of the interval [0,∞), the function κ: ℕ → ℕ repeats its values infinitely many times, and . Any of these spaces has the quasi-equivalence property.
@article{bwmeta1.element.bwnjournal-article-smv120i3p219bwm, author = {P. Djakov and V. Zahariuta}, title = {On Dragilev type power K\"othe spaces}, journal = {Studia Mathematica}, volume = {119}, year = {1996}, pages = {219-234}, zbl = {0864.46003}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv120i3p219bwm} }
Djakov, P.; Zahariuta, V. On Dragilev type power Köthe spaces. Studia Mathematica, Tome 119 (1996) pp. 219-234. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv120i3p219bwm/
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