# A converse to a theorem of Gross, Zagier, and Kolyvagin

### Abstract

Let $E$ be a semistable elliptic curve over $\mathbb {Q}$. We prove that if $E$ has non-split multiplicative reduction at at least one odd prime or split multiplicative reduction at at least two odd primes, then $$\mathrm{rank}_\mathbb{Z} E(\mathbb {Q}) =1 \,\, \text {and} \,\, \#Ш(E)<\infty \Rightarrow \mathrm {ord}_{s=1}L(E,s)=1.$$ We also prove the corresponding result for the abelian variety associated with a weight 2 newform $f$ of trivial character. These, and other related results, are consequences of our main theorem, which establishes criteria for $f$ and $H^1_f(\mathbb {Q},V)$, where $V$ is the $p$-adic Galois representation associated with $f$, that ensure that $\mathrm {ord}_{s=1}L(f,s)=1$. The main theorem is proved using the Iwasawa theory of $V$ over an imaginary quadratic field to show that the $p$-adic logarithm of a suitable Heegner point is non-zero.

## Authors

Christopher Skinner

Princeton University, Princeton, NJ