Update README.md

Not sure about this, but seems like D(x1, x2) + D(x2, x3) should be > D(x1,x3)
Merge pull request #1 from gully/patch-1

Update README.md
Update README.md

Please double check my logic here, but I think it should be k=1 is Cauchy, not k=2...
Update README.md

minor, add a carriage return
Merge pull request #2 from gully/patch-1

Erratum_page99
add chapter 10 figure discussion