A fundamental solution for a subelliptic operator

A fundamental solution for a subelliptic operator
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DOI:
10.1090/s0002-9904-1973-13171-4
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发表时间:
1973-03
影响因子:
1.3
通讯作者:
G. Folland
G. Folland
中科院分区:
数学1区
文献类型:
--
作者:
G. Folland

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1. Introduction. Let^ f: C (M)-> C (M) be a formally selfadjoint differential operator of order 2 on the Riemannian manifold M. if is said to be subelliptic of order e (0< e< 1) at xe M if there exist a neighborhood V of x and a constant c> 0 such that for all u e CQ (V),