Un tipo di approssimazione dell’operatore \(\sum_{i,j=1}^{n} D_ i\left(a_{ij}(x) D_ j\right)\) con operatori \(\sum_{j=1}^{n} D_ j \left( \beta(x) D_ j\right)\). (Italian) Zbl 0187.35305
Keywords:
partial differential equationsReferences:
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