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We analyze Galerkin discretizations of a new well-posed mixed space-timevariational formulation of parabolic PDEs. For suitable pairs of finite elementtrial spaces, the resulting Galerkin operators are shown to be uniformlystable. The method is compared to two related space-time discretization methodsintroduced in [IMA J. Numer. Anal., 33(1) (2013), pp. 242-260] by R. Andreevand in [Comput. Methods Appl. Math., 15(4) (2015), pp. 551-566] by O.Steinbach.

Stability of Galerkin discretizations of a mixed space-time variational formulation of parabolic evolution equations