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

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Uniform position property and general hyperplanes

The answer to both questions is negative, as pointed out by aginesky in the comments. To complete his answer, let me give a simple concrete counterexample. Consider a canonical curve $C$ of genus 4 w …
Roberto Pignatelli's user avatar
1 vote
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The geometric genus under a generically finite to one rational map

Mohan' answer in the comments is correct: this is more a comment to his answer. If you are only interested in the inequality you do not need Riemann-Hurwitz formula as I will explain in the following …
Roberto Pignatelli's user avatar
2 votes

Disjoint curves in an algebraic surface

The answer is clearly affirmative for $b=1$, which unfortunately corresponds only to 101 surfaces, including ${\mathbb P}^2$. I doubt that there is a single other case in which it works. Indeed I do …
Roberto Pignatelli's user avatar