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To Karl Menger on the occasion of his 65th birthday
This research was supported in part by NSF grants GP-4522 and GP-2541.
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Schweizer, B., Sklar, A. Function systems. Math. Ann. 172, 1–16 (1967). https://doi.org/10.1007/BF01351670
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DOI: https://doi.org/10.1007/BF01351670