User talk:Songjie509

Welcome[edit]

Welcome!

Hello, Songjie509, 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 Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{helpme}} before the question. Again, welcome! Awickert (talk) 06:38, 22 April 2009 (UTC)[reply]

Whitney C^k-topology[edit]

Further to your question on the maths reference desk; I decided to write an article on the Whitney C^k-topologies and the Whitney C^∞-topology. I hope you find it useful. — Fly by Night (talk) 21:05, 12 August 2010 (UTC)[reply]