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September  2015, 35(9): 4345-4366. doi: 10.3934/dcds.2015.35.4345

Integral representations for bracket-generating multi-flows

Ermal Feleqi 1, and  Franco Rampazzo 1,

1. 

Dipartimento di Matematica, Università degli Studi di Padova, Via Trieste 63 - 35121 - Padova (PD), Italy, Italy

Received  May 2014 Revised  September 2014 Published  April 2015

If $f_1,f_2$ are smooth vector fields on an open subset of an Euclidean space and $[f_1,f_2]$ is their Lie bracket, the asymptotic formula \begin{equation}\label{abstract:EQ} \Psi_{[f_1,f_2]}(t_1,t_2)(x) - x =t_1t_2 [f_1,f_2](x) +o(t_1t_2), \,                                         (1) \end{equation} where we have set $\Psi_{[f_1,f_2]}(t_1,t_2)(x) \overset{\underset{\mathrm{def}}{}}{=} \exp(-t_2 f_2)\circ \exp(-t_1f_1) \circ \exp(t_2f_2) \circ \exp(t_1f_1)(x)$, is valid for all $t_1,t_2$ small enough. In fact, the integral, exact formula \begin{equation}\label{abstract:EQ} \Psi_{[f_1,f_2]}(t_1,t_2)(x) - x = \int_0^{t_1}\int_0^{t_2}[f_1,f_2]^{(s_2,s_1)} (\Psi(t_1,s_2)(x))ds_1\,ds_2 ,                                  (2) \end{equation} where $[f_1,f_2]^{(s_2,s_1)}(y) \overset{\underset{\mathrm{def}}{}}{=} D (\exp(s_1f_1) \circ \exp(s_2f_2)))^{-1}(y) \cdot [f_1,f_2](\exp (s_1f_1) \circ \exp(s_2f_2)(y) ), $ has also been proven. Of course (2) can be regarded as an improvement of (1). In this paper we show that an integral representation like (2) holds true for any iterated Lie bracket made of elements of a family ${f_1,\dots,f_m}$ of vector fields. In perspective, these integral representations might lie at the basis for extensions of asymptotic formulas involving non-smooth vector fields.
Keywords: asymptotic formulas, Chow's theorem, integral formulas, multi-flows, Iterated Lie brackets, low smoothness hypotheses.
Mathematics Subject Classification: Primary: 34A26, 34H05; Secondary: 93B0.
Citation: Ermal Feleqi, Franco Rampazzo. Integral representations for bracket-generating multi-flows. Discrete & Continuous Dynamical Systems - A, 2015, 35 (9) : 4345-4366. doi: 10.3934/dcds.2015.35.4345
References:
[1]

A. A. Agračev and R. V. Gamkrelidze, Exponential representation of flows and a chronological enumeration,, Mat. Sb. (N.S.), 107 (1978), 467.   Google Scholar

[2]

A. A. Agračev and R. V. Gamkrelidze, Chronological algebras and nonstationary vector fields,, in Problems in geometry, 11 (1980), 135.   Google Scholar

[3]

M. Bramanti, L. Brandolini and M. Pedroni, Basic properties of nonsmooth Hörmander's vector fields and Poincaré's inequality,, Forum Math., 25 (2013), 703.  doi: 10.1515/form.2011.133.  Google Scholar

[4]

A. Montanari and D. Morbidelli, Nonsmooth Hörmander vector fields and their control balls,, Trans. Amer. Math. Soc., 364 (2012), 2339.  doi: 10.1090/S0002-9947-2011-05395-X.  Google Scholar

[5]

A. Montanari and D. Morbidelli, Almost exponential maps and integrability results for a class of horizontally regular vector fields,, Potential Anal., 38 (2013), 611.  doi: 10.1007/s11118-012-9289-6.  Google Scholar

[6]

A. Montanari and D. Morbidelli, Step-$s$ involutive families of vector fields, their orbits and the Poincaré inequality,, J. Math. Pures Appl. (9), 99 (2013), 375.  doi: 10.1016/j.matpur.2012.09.005.  Google Scholar

[7]

A. Montanari and D. Morbidelli, Generalized Jacobi identities and ball-box theorem for horizontally regular vector fields,, J. Geom. Anal., 24 (2014), 687.  doi: 10.1007/s12220-012-9351-z.  Google Scholar

[8]

F. Rampazzo and H. J. Sussmann, Set-valued differentials and a nonsmooth version of Chow-Rashevski's theorem,, in Proceedings of the 40th IEEE Conference on Decision and Control, (2001), 2613.   Google Scholar

[9]

F. Rampazzo and H. J. Sussmann, Commutators of flow maps of nonsmooth vector fields,, J. Differential Equations, 232 (2007), 134.  doi: 10.1016/j.jde.2006.04.016.  Google Scholar

[10]

E. T. Sawyer and R. L. Wheeden, Hölder continuity of weak solutions to subelliptic equations with rough coefficients,, Mem. Amer. Math. Soc., 180 (2006).  doi: 10.1090/memo/0847.  Google Scholar

show all references

References:
[1]

A. A. Agračev and R. V. Gamkrelidze, Exponential representation of flows and a chronological enumeration,, Mat. Sb. (N.S.), 107 (1978), 467.   Google Scholar

[2]

A. A. Agračev and R. V. Gamkrelidze, Chronological algebras and nonstationary vector fields,, in Problems in geometry, 11 (1980), 135.   Google Scholar

[3]

M. Bramanti, L. Brandolini and M. Pedroni, Basic properties of nonsmooth Hörmander's vector fields and Poincaré's inequality,, Forum Math., 25 (2013), 703.  doi: 10.1515/form.2011.133.  Google Scholar

[4]

A. Montanari and D. Morbidelli, Nonsmooth Hörmander vector fields and their control balls,, Trans. Amer. Math. Soc., 364 (2012), 2339.  doi: 10.1090/S0002-9947-2011-05395-X.  Google Scholar

[5]

A. Montanari and D. Morbidelli, Almost exponential maps and integrability results for a class of horizontally regular vector fields,, Potential Anal., 38 (2013), 611.  doi: 10.1007/s11118-012-9289-6.  Google Scholar

[6]

A. Montanari and D. Morbidelli, Step-$s$ involutive families of vector fields, their orbits and the Poincaré inequality,, J. Math. Pures Appl. (9), 99 (2013), 375.  doi: 10.1016/j.matpur.2012.09.005.  Google Scholar

[7]

A. Montanari and D. Morbidelli, Generalized Jacobi identities and ball-box theorem for horizontally regular vector fields,, J. Geom. Anal., 24 (2014), 687.  doi: 10.1007/s12220-012-9351-z.  Google Scholar

[8]

F. Rampazzo and H. J. Sussmann, Set-valued differentials and a nonsmooth version of Chow-Rashevski's theorem,, in Proceedings of the 40th IEEE Conference on Decision and Control, (2001), 2613.   Google Scholar

[9]

F. Rampazzo and H. J. Sussmann, Commutators of flow maps of nonsmooth vector fields,, J. Differential Equations, 232 (2007), 134.  doi: 10.1016/j.jde.2006.04.016.  Google Scholar

[10]

E. T. Sawyer and R. L. Wheeden, Hölder continuity of weak solutions to subelliptic equations with rough coefficients,, Mem. Amer. Math. Soc., 180 (2006).  doi: 10.1090/memo/0847.  Google Scholar

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