# A note on flux integrals over smooth regular domains

PACIFIC JOURNAL OF MATHEMATICS（2014）

Abstract

We provide new bounds on a flux integral over the portion of the boundary of one regular domain contained inside a second regular domain, based on properties of the second domain rather than the first one. This bound is amenable to numerical computation of a flux through the boundary of a domain, for example, when there is a large variation in the normal vector near a point. We present applications of this result to occupational measures and two-dimensional differential equations, including a new proof that all minimal invariant sets in the plane are trivial.

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Key words

flux integral,smooth,regular domain,occupational measure

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