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Sia l'insieme degli operatori chiusi di uno spazio di Hilbert in uno spazio di Hilbert e se sia la distanza proiettiva fra e (cfr. ad esempio [2]). Utilizzando si dimostra una condizione necessaria e sufficiente affinchè i prodotti e esistano e siano tali che un fissato appartenga a [ insieme risolvente di ]. Ponendo e si deduce, sempre utilizzando , una caratterizzazione dei generatori infinitesimali di semi-gruppi analitici e di contrazione.
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