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I'm not sure how long this iterative questions can go on, but let me try again. Let's say $X$ is a Cohen-Macaulay scheme with an action of $\mathbb{G}_m$ (i.e. if $X$ is affine, a grading on the coordinate ring). Are the schematic fixed points $X^{\mathbb{G}_m}$ of $X$ Cohen-Macaulay? Of course, by the usual business, we can assume that $X$ is spec of a local ring with homogeneous maximal ideal. |
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Are schematic fixed-points of a Cohen-Macaulay scheme Cohen-Macaulay?I'm not sure how long this iterative questions can go on, but let me try again. Let's say $X$ is a Cohen-Macaulay scheme with an action of $\mathbb{G}_m$ (i.e. if $X$ is affine, a grading on the coordinate ring). Are the schematic fixed points $X^{\mathbb{G}_m}$ of $X$ Cohen-Macaulay? Of course, by the usual business, we can assume that $X$ is spec of a local ring with homogeneous maximal ideal.
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