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We study several variations of Hindman's theorem on $\\mathbb Q$-vector spaces; notably, we show that the uncountable analog of Hindman's theorem fails for the additive group of $\\mathbb R$ (under ZF), and for $\\mathbb Q$-vector spaces of uncountable dimension (under DC if such dimension is not well-orderable), among other results. In contrast, for Owings-typ","authors_text":"David J. Fern\\'andez Bret\\'on, Eliseo Sarmiento Rosales, Jos\\'e A. 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