[ALPS-users] Questions about MEASURE_LOCAL_AT in MPS-DMRG

Hi, This is the documentation for 'MEASURE_LOCAL_AT' MEASURE_LOCAL_AT[NAME]

Syntax for the value: [image: local_at_value.svg] Defines a new measurement called NAME where the sequence of operators op_1:...:op_n is applied to all tuples of indices (of length *n* like the number of operators) listed after the vertical bar symbol.

I have three question: Q1: Are the indices, (i_11, ...i_1n), the vertex ids or vertex coordinates or the index of the vertex in some array, or sth else? Q2: I understand that the restriction i_1 < i_2 < i_3 ... is probably there to simplify the MPS contraction but is there a simple way to go around it? Q3: There is no limit on the number of measurement or the number of operators that can be defined, right? Amir