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for questions on one dimensional algebraic varieties over any field, including questions of moduli, and questions about specific curves.

32 votes
10 answers
3k views

Which 'well-known' algebraic geometric results do not hold in characteristic 2?

A smooth curve $X$ in $\mathbb{P}^n$ is strange if there is a point $p$ which lies on all the tangent lines of $X$. Examples are $\mathbb{P}^1$ is strange and so is $y=x^2$ in characteristic $2$. The …
Jesus Martinez Garcia's user avatar