  We discuss a Lipschitz truncation technique for parabolic double-phase
problems of $p$-Laplace type in order to prove energy estimates and uniqueness
results for the Dirichlet problem. Moreover, we show existence for a
non-homogeneous double-phase problem. The Lipschitz truncation method is based
on a Whitney-type covering result and a related partition of unity in the
intrinsic geometry for the double-phase problem.

Analysis of PDEs