Geodesic
Subelliptic operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3, pp. 55-105

Voir la notice de l'article provenant de la source Math-Net.Ru

In this article we study conditions on the symbol of differential or pseudodifferential operators that characterize them as belonging to the class of subelliptic operators, the properties of which are close to those of elliptic operators. We give for the first time full proofs of the theorem about the equivalence of the algebraic conditions on the principal symbol and the conditions for subellipticity. Our results can be used in the study of boundary value problems for elliptic equations. 
@article{RM_1975_30_3_a1,
     author = {Yu. V. Egorov},
     title = {Subelliptic operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {55--105},
     publisher = {mathdoc},
     volume = {30},
     number = {3},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1975_30_3_a1/}
}
TY  - JOUR
AU  - Yu. V. Egorov
TI  - Subelliptic operators
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1975
SP  - 55
EP  - 105
VL  - 30
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1975_30_3_a1/
LA  - en
ID  - RM_1975_30_3_a1
ER  - 
%0 Journal Article
%A Yu. V. Egorov
%T Subelliptic operators
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1975
%P 55-105
%V 30
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1975_30_3_a1/
%G en
%F RM_1975_30_3_a1
Yu. V. Egorov. Subelliptic operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3, pp. 55-105. http://geodesic.mathdoc.fr/item/RM_1975_30_3_a1/