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\begin{document}$$K$$\end{document} be a totally real field, and let S\documentclass[12pt]{minimal}
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\begin{document}$$S$$\end{document} be a finite set of non-archimedean places of K\documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}. It follows from the work of Merel, Momose and David that there is a constant BK,S\documentclass[12pt]{minimal}
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\begin{document}$$B_{K,S}$$\end{document} so that if E\documentclass[12pt]{minimal}
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\begin{document}$$E$$\end{document} is an elliptic curve defined over K\documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}, semistable outside S\documentclass[12pt]{minimal}
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\begin{document}$$S$$\end{document}, then for all p>BK,S\documentclass[12pt]{minimal}
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\begin{document}$$p>B_{K,S}$$\end{document}, the representation ρ¯E,p\documentclass[12pt]{minimal}
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\begin{document}$$\overline{\rho }_{E,p}$$\end{document} is irreducible. We combine this with modularity and level lowering to show the existence of an effectively computable constant CK,S\documentclass[12pt]{minimal}
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\begin{document}$$C_{K,S}$$\end{document}, and an effectively computable set of elliptic curves over K\documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document} with CM E1,⋯,En\documentclass[12pt]{minimal}
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\begin{document}$$E_1,\cdots ,E_n$$\end{document} such that the following holds. If E\documentclass[12pt]{minimal}
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\begin{document}$$E$$\end{document} is an elliptic curve over K\documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document} semistable outside S\documentclass[12pt]{minimal}
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\begin{document}$$S$$\end{document}, and p>CK,S\documentclass[12pt]{minimal}
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\begin{document}$$p>C_{K,S}$$\end{document} is prime, then either ρ¯E,p\documentclass[12pt]{minimal}
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\begin{document}$$\overline{\rho }_{E,p}$$\end{document} is surjective, or ρ¯E,p∼ρ¯Ei,p\documentclass[12pt]{minimal}
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\begin{document}$$\overline{\rho }_{E,p} \sim \overline{\rho }_{E_i,p}$$\end{document} for some i=1,⋯,n\documentclass[12pt]{minimal}
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\begin{document}$$i=1,\dots ,n$$\end{document}.
