Two line subscript in LaTeX

\usepackage{amsmath}

Then use the \substack command.

\lim_{\substack{x\rightarrow 0\\y\rightarrow 0}} f(x,y)

copied from http://blog.32leaves.net/?p=262

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How to share data in multiprocessing in python

from scipy import sparse
from multiprocessing import Pool
import multiprocessing
import functools

def myfunc(x,ns):
    A=ns.A
    return A[x,:]*A*A[:,x]

manager = multiprocessing.Manager()
Global = manager.Namespace()
pool=Pool()
Global.A=sparse.rand(10000,10000,0.5,'csr')
myfunc2=functools.partial(myfunc,ns=Global)
r=pool.map(myfunc2, range(100))