[18335fall08] 18.335 pset1 correction to problem 2

[Steven G. Johnson]

Hi gang,

It turns out that I mis-stated problem 2 in a way that made it  
impossible (I think)---basically, your new "LU" factorization by the  
procedure I suggested would have an upper-triangular U, but not a  
lower-triangular L.

I've posted a modified pset1 that corrects this by relaxing the  
problem somewhat.  Please download and use the corrected pset1, posted  
on the 18.335 web page (math.mit.edu/~stevenj/18.335/pset1.pdf)

--SGJ