Bieske, Thomas2021-08-032021-08-032007-02-14Bieske, T. (2007). A comparison principle for a class of subparabolic equations in Grushin-type spaces. Electronic Journal of Differential Equations, 2007(30), pp. 1-9.1072-6691https://hdl.handle.net/10877/14180We define two notions of viscosity solutions to subparabolic equations in Grushin-type spaces, depending on whether the test functions concern only the past or both the past and the future. We then prove a comparison principle for a class of subparabolic equations and show the sufficiency of considering the test functions that concern only the past.Text9 pages1 file (.pdf)enAttribution 4.0 InternationalGrushin-type spacesParabolic equationsViscosity solutionsArticle