Singolarità di linea e di punto in cristalli liquidi nematici con graào à'orientamento variabile. Si esaminano le singolarità di linea e di punto, che spesso sono presenti nei cristalli liquidi, alla luce di una nuova teoria di Ericksen in cui si ammette che il grado d'orientamento del cristallo possa variare nello spazio.
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Con il contributo del Ministero per i Beni e le Attività Culturali