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    Sharpness of the lower bound for Grushin observability time

    Let u0 u0, let boldsymbolOmega=boldsymbolOmegaxtimesboldsymbolOmegayboldsymbol{Omega}=boldsymbol{Omega}xtimesboldsymbol{Omega}y be the domain, and let boldsymbolomega=boldsymbolomegaxtimesboldsymbolOmegayboldsymbol{omega}=boldsymbol{omega}xtimesboldsymbol{Omega}y be an open observa…