# The Manin constant in the semistable case

## TL;DR

This paper proves Manin's conjecture for semistable elliptic curves, provides counterexamples to its higher-dimensional generalizations, and explores relations between different cohomology theories and Neron models.

## Contribution

It confirms Manin's conjecture in the semistable case, refutes proposed generalizations, and introduces new results on cohomology relations and Neron models.

## Key findings

- Manin conjecture proven for semistable elliptic curves
- Counterexamples found for higher-dimensional generalizations
- New exactness results for Neron models

## Abstract

For an optimal modular parametrization $J_0(n) \twoheadrightarrow E$ of an elliptic curve $E$ over $\mathbb{Q}$ of conductor $n$, Manin conjectured the agreement of two natural $\mathbb{Z}$-lattices in the $\mathbb{Q}$-vector space $H^0(E, \Omega^1)$. Multiple authors generalized his conjecture to higher dimensional newform quotients. We prove the Manin conjecture for semistable $E$, give counterexamples to all the proposed generalizations, and prove several semistable special cases of these generalizations. The proofs establish general relations between the integral $p$-adic etale and de Rham cohomologies of abelian varieties over $p$-adic fields and exhibit a new exactness result for Neron models.