i would like to know because the term $D_{z}f|Du|^{2}$ appears in the proof of gradient estimate
I supppose that $D_{z}f|Du|^{2} = 0$, since $f$ is a function of $(x,u) \in \Omega$
2026-03-27 10:43:00.1774608180
Gradient Estimates for semi-linear equations
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