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35J15 - Second order elliptic equations [MSC 2020] |
35J46 - First-order elliptic systems [MSC 2020] |
35J47 - Second-order elliptic systems [MSC 2020] |
35J48 - Higher-order elliptic systems [MSC 2020] |
35J56 - Boundary value problems for first-order elliptic systems [MSC 2020] |
35J57 - Boundary value problems for second-order elliptic systems [MSC 2020] |
35J58 - Boundary value problems for higher-order elliptic systems [MSC 2020] |