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May 4, 2020 at 8:44 comment added Chen Jiang There are trivial counterexamples like $ X=\mathbb{P}(a_0,\cdots, a_{n-1})\subset \mathbb{P}(a_0,\cdots, a_{n-1}, a_n) $ and $ Y=\mathbb{P}(a_0,\cdots, a_{n-1})\subset \mathbb{P}(a_0,\cdots, a_{n-1}, b_n) $
Mar 28, 2020 at 16:45 history asked user61586 CC BY-SA 4.0