### 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!

If some Qs had been asked before, just reply me the link is okey~~~

bow~~~

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!

If some Qs had been asked before, just reply me the link is okey~~~

bow~~~