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Nov 5, 2013 at 11:45 history edited Name CC BY-SA 3.0
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Nov 3, 2013 at 15:52 comment added Name Yves Cornulier, thank for the exact reference.
Nov 3, 2013 at 15:43 comment added YCor This is Corollary 2 of Theorem 6.3 in: P. M. Cohn, The embedding of firs in skew fields, Proc. London Math. Soc. (3) 23 (1971), 193-213.
Nov 3, 2013 at 15:22 history answered Name CC BY-SA 3.0