Online documentation is available https://docs.gridlabd.us/index.html?owner=dchassin&project=math&doc=/README.md.
To install math from the installs script, run the following command
% curl -sL https://raw.githubusercontent.com/dchassin/math/master/install.sh | bash
To install math manually, run the following commands
% curl -sL https://raw.githubusercontent.com/dchassin/math/master/src/math.py > /usr/local/bin/math
% chmod +x /usr/local/bin/math
% export PATH=/usr/local/bin:$PATH