Eight kinds of reader, and what each one gets from the same engine.
The homework mathematics, computed properly, on the plan that costs nothing.
Everyone in the class gets the same working environment, with nothing to install.
Derivations, models and fits - with sessions that keep state, and one bill for the group.
Site access to a computational engine, with the usage statistics a renewal decision needs.
The rectifier, the controller and the transform - computed, not sketched.
One endpoint, a token, and an engine that answers.
For courses and prototyping: the circuit, simulated; the algebra, computed.
The researcher's tool first - with the compliance answer stated before you ask for it.