Ross indexed the following pages under the keyword: "Derivative".

Summary: Replacing variables by derivatives. 3723, 4296, 5202 Derivative replacing variable Latent roots unobservable variables Higher geometry of fields and matrix theory [16]: The latent roots are invariant when variables are replaced by derivatives. 3717, 3719. 3718 3719

Summary: Simplification by running together, or deleting, the elements of time. 5165, 5245 Summary: "Loss of control" in set theory. 5155 Control in set theory Convergence (of lines of behaviour) loss of control Derivative and set theory Information non-transmission 5152 5153

Derivative replacing variable Difference replacing variable Protocol general theory of Protocol general theory of 5202 5203