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Feb 3, 2014 at 21:47 comment added Raphael Albrecht See also the classic text on differential topology by M.W. Hirsch (by the same title) theorem 2.1 on p. 43 and corollary = ercx. 1 on p.55
Feb 3, 2014 at 21:31 history answered Raphael Albrecht CC BY-SA 3.0