atopic-rhinitis
发表于 2025-3-30 08:16:01
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BILIO
发表于 2025-3-30 12:53:31
https://doi.org/10.1007/978-3-540-85523-1rder 4 and 2 respectively to be equivalent with an eigenvalue problem involving a linear, compact, positive integral operator. By means of the theory for such operators the existence of a nonnegative eigenfunction belonging to the smallest positive eigenvalue of the original problem is concluded. Th