It is proved that every weakly non-quasianalytic ultradifferentiable curve with values in a Frechet space E is topologically (or strongly) ultradifferentiable if and only if the space E satisfies the topological invariant (DN), thus solving a problem posed by Kriegl and Michor.
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Univ Salento, Dipartimento Matemat & Fis E De Giorgi, CP 193, I-73100 Lecce, ItalyUniv Salento, Dipartimento Matemat & Fis E De Giorgi, CP 193, I-73100 Lecce, Italy
Albanese, Angela A.
Bonet, Jose
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Univ Politecn Valencia, IUMPA, E-46071 Valencia, SpainUniv Salento, Dipartimento Matemat & Fis E De Giorgi, CP 193, I-73100 Lecce, Italy
Bonet, Jose
Ricker, Werner J.
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Katholische Univ Eichstatt Ingolstadt, Math Geogr Fak, D-85072 Eichstatt, GermanyUniv Salento, Dipartimento Matemat & Fis E De Giorgi, CP 193, I-73100 Lecce, Italy