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arxiv: 2606.08384 · v1 · pith:6H2NWUS4new · submitted 2026-06-07 · 🧮 math.LO

Discontinuous homomophisms without Hamel bases

classification 🧮 math.LO
keywords discontinuoushamellinerealbasesbasisdirectexists
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We produce a model of ZF + DC in which there exists a discontinuous homomorphism from the real line to itself but no Hamel basis for the real line, and prove a generalization of this result in terms of internal direct sums.

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