User talk:Songjie509
Welcome
[edit]Welcome!
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Awickert (talk) 06:38, 22 April 2009 (UTC)
Whitney C^k-topology
[edit]Further to your question on the maths reference desk; I decided to write an article on the Whitney Ck-topologies and the Whitney C∞-topology. I hope you find it useful. — Fly by Night (talk) 21:05, 12 August 2010 (UTC)