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(ref: ). do not use this tag for elementary problems in linear algebra or geometry.
subset \mathbb p^n$ is a variety (edit: let's say $x$ is a hypersurface in $\mathbb p^n$, as pointed out in the comment) and $x\in x$ is a singular point which is not isolated. intuitively, ... algebraic-geometry complex-geometry intersection-theory singularity-theory asked hours ago user x silver badges...
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