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Problème de Cauchy et fonctions surharmoniques. (French) Zbl 0341.35044
Semin. Theor. Potent., Paris, No. 2, Lect. Notes Math. 563, 202-218 (1976).

35K15 Initial value problems for second-order parabolic equations
34G99 Differential equations in abstract spaces
31C05 Harmonic, subharmonic, superharmonic functions on other spaces
47D03 Groups and semigroups of linear operators