Abstract
Let C(X, ℤ), C(X, ℂ) and C(X) denote the ℓ-groups of integer-valued, rational-valued and real-valued continuous functions on a topological space X, respectively. Characterizations are given for the extensions C(X, ℤ) ⩽ C(X, ℚ) ⩽ C(X) to be rigid, major, and dense.
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Knox, M.L., McGovern, W.W. Rigid extensions of ℓ-groups of continuous functions. Czech Math J 58, 993–1014 (2008). https://doi.org/10.1007/s10587-008-0064-1
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DOI: https://doi.org/10.1007/s10587-008-0064-1