SageMath

SageMath integrates symbolic, numerical and plotting packages through a Python-based environment. Its version 10.8 algebra tutorial declares symbolic variables with var, solves equations exactly and uses find_root with a chosen interval when an exact solution is unavailable. Numerical approximation's n argument is bits of precision, rather than decimal places. The linked shell guide distinguishes logging/replaying commands from saving objects or sessions: compressed .sobj files can retain objects, while save_session stores supported user variables. load_session merges them into the current session rather than clearing unrelated variables. Some foreign-system objects cannot be restored, and changed class definitions can prevent later-version reloads. The GPL system has local installation routes, with Windows directed to WSL; CoCalc and SageCell are separate hosted entry points with their own conditions.