Abstract
In this paper we study the strong maximum principle for globally hypoelliptic differential operators of second-order, and reveal the underlying analytical mechanism of propagation of maximums in terms of the Lie algebra generated by diffusion vector fields and the Fichera function. Our formulation of the strong maximum principle is coordinate-free. The results here may be applied to questions of uniqueness for degenerate elliptic boundary value problems on a manifold. Furthermore, the mechanism of propagation of maximums plays an important role in the interpretation and study of Markov processes from the viewpoint of functional analysis.
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References
Amano, K.: Maximum principles for degenerate elliptic–parabolic operators. Indiana Univ. Math. J. 29, 545–557 (1979)
Bony, J.-M.: Principe du maximum, inégalité de Harnack et unicité du problème de Cauchy pour les opérateurs elliptiques dégénérés. Ann. Inst. Fourier (Grenoble) 19, 277–304 (1969)
Bony, J.-M., Courrège, P., Priouret, P.: Semigroupes de Feller sur une variété à bord compacte et problèmes aux limites intégro-différentiels du second ordre donnant lieu au principe du maximum. Ann. Inst. Fourier (Grenoble) 18, 369–521 (1968)
Chazarain, J., Piriou, A.: Introduction à la théorie des équations aux dérivées partielles linéaires. Gauthier-Villars, Paris (1981)
Chow, W.-L.: Über Systeme von linearen partiellen Differentialgleichungen erster Ordnung. Math. Ann. 117, 98–105 (1940)
Fefferman, C., Phong, D.H.: Subelliptic eigenvalue problems. Conference on Harmonic Analysis (1981: Chicago, Ill), pp. 590–606. Wadsworth, Belmont, CA (1983)
Fichera, G.: Sulle equazioni differenziali lineari ellittico-paraboliche del secondo ordine. Atti Accad. Naz. Lincei. Mem. Cl. Sci. Fis. Mat. Nat. Sez. I. 8(5), 1–30 (1956)
Friedman, A.: Remarks on the maximum principle for parabolic equations and its applications. Pac. J. Math. 8, 201–211 (1958)
Fujiwara, D., Omori, H.: An example of a globally hypo-elliptic operator. Hokkaido Math. J. 12, 293–297 (1983)
Gilbarg, D., Trudinger, N.S.: Elliptic Partial Differential Equations of Second Order, Reprint of the Classics in Mathematics, 1998th edn. Springer, Berlin (2001)
Hill, C.D.: A sharp maximum principle for degenerate elliptic–parabolic equations. Indiana Univ. Math. J. 20, 213–229 (1970)
Hopf, E.: Elementare Bemerkungen über die Lösungen partieller Differentialgleichungen zweiter ordnung vom elliptischen Typus, Sitz. Ber. Preuss. Akad. Wissensch. Berl. Math. Phys. Kl 19, 147–152 (1927)
Hörmander, L.: Pseudodifferential operators and non-elliptic boundary problems. Ann. Math. 2(83), 129–209 (1966)
Hörmander, L.: Hypoelliptic second order differential equations. Acta Math. 119, 147–171 (1967)
Hörmander, L.: A class of hypoeiliptic pseudodifferential operators with double characteristics. Math. Ann. 217, 165–188 (1975)
Hörmander, L.: The Analysis of Linear Partial Differential Operators III, Pseudo-differential Operators, Reprint of the 1994 Edition, Grundlehren der mathematischen Wissenschaften. Springer, Berlin (2007)
Nicolaescu, L.I.: Lectures on the Geometry of Manifolds, 2nd edn. World Scientific Publishing, Hackensack, NJ (2007)
Nirenberg, L.: A strong maximum principle for parabolic equations. Commun. Pure Appl. Math. 6, 167–177 (1953)
Oleĭnik, O.A.: On properties of solutions of certain boundary problems for equations of elliptic type. Mat. Sb. 30, 595–702 (1952). (in Russian)
Oleĭnik, O.A., Radkevič, E.V.: Second Order Equations with Nonnegative Characteristic Form. Itogi Nauki, Moscow (1971). ((in Russian); English translation: Amer. Providence, Rhode Island and Plenum Press, New York, Math. Soc. (1973))
Protter, M.H., Weinberger, H.F.: Maximum Principles in Differential Equations, Corrected Second Printing. Springer, New York (1984)
Radkevič, E.V.: A priori estimates and hypoelliptic operators with multiple characteristics. Dokl. Akad. Nauk SSSR 187, 274–277 (1969). ((in Russian); English translation in Soviet Math. Dokl. 10, 849–853 (1969))
Redheffer, R.M.: The sharp maximum principle for nonlinear inequalities. Indiana Univ. Math. J. 21, 227–248 (1971)
Stroock, D.W., Varadhan, S.R.S.: On the support of diffusion processes with applications to the strong maximum principle. In: Proceedings of the Sixth Berkeley Symposium of Probability and Mathematical Statistics, vol. 3, pp. 333–359 (1972)
Stroock, D.W., Varadhan, S.R.S.: On degenerate elliptic–parabolic operators of second order and their associated diffusions. Commun. Pure Appl. Math. 25, 651–713 (1972)
Taira, K.: A strong maximum principle for degenerate elliptic operators. Commun. Partial Differ. Equ. 4, 1201–1212 (1979)
Taira, K.: Semigroups and boundary value problems. Duke Math. J. 49, 287–320 (1982)
Taira, K.: Le principe du maximum et l’hypoellipticité globale. Séminaire Bony–Sjöstrand–Meyer 1984–1985, Exposé No. I, Ecole Polytechnique, Palaiseau (1985)
Taira, K.: Diffusion Processes and Partial Differential Equations. Academic Press Inc., Boston, MA (1988)
Taira, K.: Semigroups, Boundary Value Problems and Markov Processes. Springer Monographs in Mathematics, 2nd edn. Springer, Heidelberg (2014)
Yoshino, M.: A class of globally hypoelliptic operators on the torus. Math. Z. 201, 1–11 (1989)
Acknowledgements
The author is grateful to the referee for many valuable suggestions and comments, which have improved substantially the presentation of the present paper. He is also indebted to Professors Hajime Sato and Koichi Uchiyama for formulating the mapping \(\varPsi \) in terms of differential geometry.
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Dedicated to Professor Izumi Kubo on the occasion of his 80th birthday.
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Taira, K. A strong maximum principle for globally hypoelliptic operators. Rend. Circ. Mat. Palermo, II. Ser 68, 193–217 (2019). https://doi.org/10.1007/s12215-018-0351-0
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DOI: https://doi.org/10.1007/s12215-018-0351-0