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Jan 17, 2013 at 16:07 comment added Werner Thumann Hi Stephan, sorry, but I wanted to include also the non-symmetric case. But thanks for your answer!
Jan 17, 2013 at 10:14 history edited Stephan Müller CC BY-SA 3.0
added 567 characters in body
Jan 17, 2013 at 8:35 history edited Stephan Müller CC BY-SA 3.0
added 21 characters in body
Jan 17, 2013 at 8:25 history edited Stephan Müller CC BY-SA 3.0
fixed some typos
Jan 16, 2013 at 19:10 history answered Stephan Müller CC BY-SA 3.0