Let E be a Fréchet Schwartz space with a continuous norm and with a finite-dimensional decomposition, and let F be any infinite-dimensional subspace of E. It is proved that E can be written as G ⨁ H where G and H do not contain any subspace isomorphic to F. In particular, E is not primary. If the subspace F is not normable then the statement holds for other quasinormable Fréchet spaces, e.g., if E is a quasinormable and locally normable Köthe sequence space, or if E is a space of holomorphic functions of bounded type , where U is a Banach space or a bounded absolutely convex open set in a Banach space.
@article{bwmeta1.element.bwnjournal-article-smv126i3p291bwm, author = {J. D\'\i az}, title = {On non-primary Fr\'echet Schwartz spaces}, journal = {Studia Mathematica}, volume = {122}, year = {1997}, pages = {291-307}, zbl = {0896.46001}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv126i3p291bwm} }
Díaz, J. On non-primary Fréchet Schwartz spaces. Studia Mathematica, Tome 122 (1997) pp. 291-307. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv126i3p291bwm/
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