Catégories
> 35-XX Partial differential equations > 35HXX Close-to-elliptic equations
 35H10 Hypoelliptic equations | 35H20 Subelliptic equations |  35H30 Quasi-elliptic equations |
| 35H99 None of the above, but in this section |
35HXX Close-to-elliptic equations
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