A control volume is a mathematical construct used in the process of creating mathematical models of physical processes.

We assume that the control volume in R^4 space (3D+t external control) is incomplete and almost useless for dealing with complex physical and mathematical problems.

On the other hand, the 4D x-t unitary control volume called Cairo techniques and B matrix space is the complete universal space adequate for the description of classical and quantum physics situations as well as mathematical events.

In a way, this is the correct approach to the unified field theory (energy density).

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