Conjecture on decomposition and residual irreducibility of compatible systems

Let KK be a number field, and let M\mathcal{M} be an nn-dimensional strictly compatible system over KK. A compatible system is called irreducible if each representation in it is irreducible, Lie-irreducible if each representation is Lie-irreducible, and regular if its Hodge–Tate weights satisfy the regularity condition.

Compatible-systems conjecture.

  1. M\mathcal{M} decomposes as a direct sum of irreducible strictly compatible systems.
  2. If M\mathcal{M} is irreducible, then its representations are residually irreducible for all but finitely many primes.
  3. If M\mathcal{M} is irreducible and regular, then it is induced from a Lie-irreducible strictly compatible system over a finite extension of KK.

These assertions are proposed as extensions of the uniform irreducibility properties known for compatible systems arising from elliptic curves. The parser supplies no evidence that the conjecture has been resolved; its status is therefore open.

Sources & referencesView supporting material

Primary source

Boyi Dai, “On irreducibility of six-dimensional compatible systems of Q”, arXiv:2503.04541 (2026).

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