To install the AtomicDensityMatrix Mathematica package: 1. Download ADM_xx.xx.xx.zip 2. Unzip into the "Applications" subdirectory of the Mathematica base directory. You can find this directory by evaluating ToFileName[{$BaseDirectory, "Applications"}] or ToFileName[{$UserBaseDirectory, "Applications"}] in Mathematica. 3. After restarting Mathematica, the beginnings of a help file and demos should be available in the Mathematica Documentation Center under "Installed Add-Ons" (lower right-hand corner). 4. The package can be loaded into Mathematica by evaluating <