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Let $M$ be Hadamard manifold with sectional curvature $K_{M}\leq-k^{2}$,$k>0$. Denote by $\partial_{\infty}M$ the asymptotic boundary of $M$. We saythat $M$ satisfies the strict convexity condition (SC condition) if, given$x\in\partial_{\infty}M$ and a relatively open subset$W\subset\partial_{\infty}M$ containing $x$, there exists a $C^{2}$ open subset$\Omega\subset M$ such that $x\in\operatorname*{Int}(\partial_{\infty}\Omega)\subset W$ and $M\setminus\Omega$ is convex. We prove that the SC conditionimplies that $M$ is regular at infinity relative to the operator$$\mathcal{Q}[u] :=\mathrm{{div}}(\frac{a(|\nabla u|)}{|\nabla u|}\nabla u),$$subject to some conditions. It follows that under the SC condition, theDirichlet problem for the minimal hypersurface and the $p$-Laplacian ($p>1$)equations are solvable for any prescribed continuous asymptotic boundary data.It is also proved that if $M$ is rotationally symmetric or if$\inf_{B_{R+1}}K_{M}\geq-e^{2kR}/R^{2+2\epsilon}, R\geq R^{\ast},$ for some$R^{\ast}$ and $\epsilon>0,$ where $B_{R+1}$ is the geodesic ball with radius$R+1$ centered at a fixed point of $M,$ then $M$ satisfies the SC condition.

Regularity at infinity of Hadamard manifolds with respect to some elliptic operators and applications to asymptotic Dirichlet problems