Taku Matsui
Symmetry of the Spin Ladder 
(449K, Postscript)

ABSTRACT.  We consider the symmetry breaking of pure states of 
quantum spin chain. 
We show that our new strong mixing condition 
automatically leads to certain symmetry breaking. 
This explains the reason why the decay of two point correlation 
functions is slow for the spin ladder systems with an odd number of 
legs.