Harnack inequality for degenerate elliptic equations and sum operators
Giuseppe Di Fazio Maria Stella Fanciullo Pietro Zamboni
We define Stummel-Kato type classes in a quasimetric homogeneous setting using sum operators introduced in [13] by Franchi, Perez and Wheeden. Then we prove a Harnack inequality for positive solutions of some linear subelliptic equations.
keywords: Harnack inequality. Stummel-Kato type classes Fefferman-Phong inequality

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