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# HOWTO

### These old HOWTO documents are obsolete.

• TutorialDmrg: A tutorial on using the toolkit for some simple groundstate calculations
• TutorialToric-code: A tutorial on using the toolkit for Toric-code model calculations and some notes for topological system simulations
• SVNSimpleGuide: A simple tutorial for basic svn commands that are useful in Toolkit
• HowtoBatch: How to use the DMRG program from a batch queue
• HowtoFrequency: How to calculate frequency-space Green’s functions
• TutorialShort: Just a list of all the commands needed for calculating the groundstate and spectral function [incomplete?]
• SpinChain: Commands for running a simple DMRG calculation on a spin chain
• HowtoTime: How to calculate real- or imaginary-time evolution
• HowtoFiniteTemperature: How to do calculations at finite temperature
• LargeScaleCalculations: Some notes on how to configure the DMRG program for large calculations
• ConfigurationFile: Notes on the configuration file for DMRG and GMRES
• SymmetricHubbardModel: Some comments on the Wigner-Eckart projection of the {$SO(4)$} symmetric Hubbard basis down to {$U(1)\times U(1)$}
• DisorderedSystems: Avoiding metastable excited states in disordered systems
• iDMRG: Infinite size DMRG
• MKLAndOpen-MPIOptimizations: A guide for making an (heavily-) optimized MKL and OpenMP configuration in a toolkit build

### Miscellaneous documents:

• ExactEnergies: A collection of some exact and numerically-exact results
• EntanglementCFT: Connection between entanglement, number of states, and CFT in 1+1D
• SMA: Some notes on excitations and iMPOs