Let $X, Y$ be projective schemes over $\mathbb{C}$ and suppose that $X \subset Y$. Let $x \in X$ be a closed point. Assume that for any positive integer $n$ and any morphism from $\mathrm{Spec} (\mathbb{C}[t]/(t^n))$ to $Y$ such that its composition with the natural morphism from $\mathrm{Spec}(\mathbb{C})$ to $\mathrm{Spec}(\mathbb{C}[t]/(t^n))$ corresponds to the closed point $x$, we have that this morphism factors through $X$. Does this imply that there exists an open neighbourhood $U$ of $x$ in $Y$ such that $U$ is contained in $X$?
A question on infinitesimal neighbourhood of a point in a projective scheme
Naga Venkata
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