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I have a PDE $$u_t = a(x,t)u_{xx} + b(x,t)u_{x} + c(x,t)u + f$$ where the coefficients are in parabolic Holder space $\widetilde{C}^{0, \alpha}(I \times [0,T])$ where $I=[0,2\pi]$. The a-priori bound (eg. from Krylov's book) is $$\lVert u \rVert_{\widetilde{C}^{2, \alpha}(I \times [0,T])} \leq C(\lVert C\left(\lVert f \rVert rVert_{\widetilde{C}^{0, \alpha}(I \times [0,T])} + \lVert u_0 \rVert)$$ rVert_{\widetilde{C}^{2, \alpha}(I \times [0,T])}\right)$$where the constant C depends on the endtime T. Does anyone know how to remove this dependence on T? I think there might be a way to do it by considering the PDE obtained when we change the coefficients somehow but am not sure. 2 added 19 characters in body I have a PDE$$u_t = a(x,t)u_{xx} + b(x,t)u_{x} + c(x,t)u + f$$where the coefficients are in parabolic Holder space \widetilde{C}^{0, \alpha}(I \times [0,T]). 0,T]) where I=[0,2\pi]. The a-priori bound (eg. from Krylov's book) is$$\lVert u \rVert_{\widetilde{C}^{2, \alpha}(I \times [0,T])} \leq C(\lVert f \rVert + \lVert u_0 \rVert)$$where the constant C depends on the endtime T. Does anyone know how to remove this dependence on T? I think there might be a way to do it by considering the PDE obtained when we change the coefficients somehow but am not sure. 1 # A-priori bound on parabolic PDE that doesn't depend on end time I have a PDE$$u_t = a(x,t)u_{xx} + b(x,t)u_{x} + c(x,t)u + f$$where the coefficients are in parabolic Holder space \widetilde{C}^{0, \alpha}(I \times [0,T]). The a-priori bound (eg. from Krylov's book) is$$\lVert u \rVert_{\widetilde{C}^{2, \alpha}(I \times [0,T])} \leq C(\lVert f \rVert + \lVert u_0 \rVert) where the constant $C$ depends on the endtime $T.$
Does anyone know how to remove this dependence on $T$? I think there might be a way to do it by considering the PDE obtained when we change the coefficients somehow but am not sure.