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We have shown that for an affine cone of a nonempty subset $X$ of $\mathbb P^n$, i.e $C(X)$, that the irreducible decomposition of $C(X)$ given by $Y_1 \cup \dots \cup Y_m$ has that $Y_i = C(X_i)$ for some closed $X_i \subseteq \mathbb P^n$.

I wanted to know, what exactly is $X_i$ in this case? I was perhaps thinking that the $X_i$ would be the irreducible components of $X$, but was curious on if this is true and how one may prove it.

Jeff
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  • Good eye! This is true because the minimal primes over a homogeneous ideal are also homogeneous, as shown at the linked duplicate. – KReiser Mar 12 '24 at 01:28

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