Page 1 of 1

### 9768 #30 #56 #60 #63

Posted: Thu Nov 05, 2009 9:04 pm
#30
I want to ask C and D.
#56
how to show that $$\sqrt{d}$$ is also a metric?
#60
I can just work out II, and only get ...maybe...s(st-ts)t=0...
why I and III are all right?
#63
why these two curve intersect 2 points when x>0?why not 0 or 1?

Thank you very much!