https://cadabra.science/qa/2297/substitution-%24a-mapsto-a-delta_a%24
Substitution $A \mapsto A + \delta_A$ - Cadabra Q&A
I want to substitute an object $A$ which goes to $A + \delta\_A$ where $\delta\_A$ is a differential or ... \delta\_B C \neq \delta\_B \delta\_A C$.
substitutiondeltacadabraq