Weak Nullstellensatz
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Theorem
Let $K$ be an algebraically closed field.
Let $n \ge 0$ be an natural number.
Let $K \sqbrk {x_1, \ldots, x_n}$ be the polynomial ring in $n$ variables over $k$.
Let $I \subseteq K \sqbrk {x_1,\ldots, x_n}$ be an ideal.
The following statements are equivalent:
- $I$ is the unit ideal: $I = (1)$.
- Its zero-locus is empty set: $\map V I = \O$.
Proof
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