User talk:Songjie509

Welcome
Welcome!

Hello,, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful: I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on, or ask your question on this page and then place  before the question. Again, welcome! Awickert (talk) 06:38, 22 April 2009 (UTC)
 * The five pillars of Wikipedia
 * Tutorial
 * How to edit a page
 * How to write a great article
 * Manual of Style

Whitney C^k-topology
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)