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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

12 votes
1 answer
1k views

An omission in K. Conrad's notes on the conductor ideal

I am referring to the very useful K. Conrad's notes on the conductor ideal of an order in a Dedekind domain: https://kconrad.math.uconn.edu/blurbs/gradnumthy/conductor.pdf $\DeclareMathOperator\Cl{Cl} …
11 votes
1 answer
1k views

Is Proposition 2.6 in J. Silverman's book Arithmetic of Elliptic Curves correct?

In J. Silverman's book "Arithmetic of Elliptic Curves" Chapter 2 Proposition 2.6 (a) it is considered a non constant morphism $\Phi:C_{1}→C_{2}$ between two smooth curves defined over a perfect field …