Published 2015-09-14T01:51:00.001Z by Physics Derivation Graph

Although the PDG can be done in a CAS (ie Mathematica), it won't translate to other CASes without having associated Godel indices.Symbols can be composed of other symbols. Example: $E$ and $\vec{E}$, $\partial$ and $\frac{\partial}{\partial t}$

Symbols can be operators, ie $\frac{\partial}{\partial t}$

Operators, ie $+$, can act on symbols