Question: Which Maple features best implement this notation?

I am beginning to study Special Relativity and Classical Field Theory - The Theoretical Minimum by Leonard Susskind and Art Friedman.

The book's notation for a 4-Vector is X superscript mu. Its components are X superscripts 0, 1, 2 and 3 which, in sequence, refer to t(ime), x, y and z.

Proper time, tau, is defined using these vector components in that sequence.

The book's notation for 4-Velocity is U superscript mu with components U superscripts 0 thru 3. U superscript zero is defined to be the derivative of X superscript zero with respect to tau i.e. dt/dtau and the remaining U components follow this pattern.

As a beginner in this area, which Maple packages/commands would most easily and clearly implement this notation in a Maple worksheet? 

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