the parameter file of spin_one_half of ALPS tutorials mentioned is,

LATTICE="open chain lattice"
MODEL="spin" 
CONSERVED_QUANTUMNUMBERS="N,Sz" 
Sz_total=0
J=1
SWEEPS=4
NUMBER_EIGENVALUES=1
L=32 
{MAXSTATES=100}

but, in the MODEL "spin" in ALPS models.xml, no such quantum number "N" is defined. So the question is why there is a non-existing quantum number showing up in the  CONSERVED_QUANTUMNUMBERS="N,Sz" ?

Bo-Nan

--
Stay foolish,Stay hungry.