Carleman Estimates with a Second Large Parameter

Carleman estimates are an indispensable tool for proving uniqueness of continuation for solutions to partial differential equations with non-analytic coefficients. We prove a new Carleman estimate with two large parameters for operators with time independent coefficients which combines features of estimates given by D. TataruŽ1995, Comm. Partial Differential Equations 20, 855 884.and V. Isakov Ž1998, On the uniqueness of continuation for a thermoelasticity system, preprint..