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10.1. MATHEMATICAL TOOLS 257<br />

Lfh(x):<br />

Lfh(x):<br />

LfL9h(x):<br />

Lfh(x):<br />

10.1.2 Lie Bracket<br />

Lfh(x) = ax f(x)<br />

= [X1 x2]<br />

a-g(x)<br />

x2 xl - x2 2<br />

x2 + xlx2 I<br />

-(xl + x2).<br />

[ xl x2]<br />

LfL9h(x) = a(Oxh)f(x)<br />

Lfh(x)<br />

-2 [xl xz] I<br />

= 2µ(1 -<br />

µ(1 - xl)x2.<br />

xl)x22.<br />

a(8xh) g(x)<br />

-2 [xl x21<br />

2(x2 + x2).<br />

-x2<br />

-xl - µ(1 - x2Dx2<br />

x2<br />

-x1 - µ(1 - xi)xz<br />

-xl - xlx 2 2<br />

x2 + x2 Ix2<br />

Definition 10.2 Consider the vector fields f, g : D C 1R" -> R. The Lie bracket of f and<br />

g, denoted by [f,g], is the vector field defined by<br />

[f,g](x) = 8<br />

,9g af<br />

xf<br />

(x) axg(x). (10.2)

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