another graph: relation of variables by expressions

[researcherben]

Suppose the variable "a" shows up in expression 6, and expression 6 also contains the variable "b". Then an edge exists between nodes "a" and "b":

"a" -- (expr 6) -- "b"

The variables a and b may both appear in other expressions. The graph could have multiple edges between any two nodes.

This graph doesn't depend on the Physics Derivation Graph being complete; it merely needs a collection of expressions.

I'm unable to come up with a use case that would get value from having this symbol graph.

[researcherben]

This graph might give insight on where to expect connectivity across domains based on commonality of variables?

For example, if variable a shows up in fluid mechanics and in thermodynamics, that hints at a mathematical connectivity.