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This the source code for CTMRG(Corner Transfer Matrix Renormalization Group) method(

CTMRG is one of the DMRG methods, and it calculates the thermodynamical quantity of the two-dimensional classical spin system efficiently.

For tensor contraction, ITensor( is called.

To compile this, you have to rewrite "Makefile", as LIBRARY_DIR=(Pass to ITensor)/itensor ... and to type "make" to compile.

In this source code, we calculate for the Ising model, but you can use it for other models by rewriting it just a little.

This source code was mainly written by qope(

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