This paper derives the principle of stationary action from the Primitive Bifurcation Law

of the Void Dynamics Model (VDM), showing that the familiar variational rule is not

an independent postulate but the temporal-path effective invariant generated when the

primitive non-discharge law is expressed on an admitted temporal domain. CF 000 proves

that same-domain articulation cannot continue indefinitely: once lawful invariant-bearing

articulation within a domain is exhausted while discharge remains impossible, orthogonal

re-articulation into a new irreducible domain is forced. The universal axiom paper A(−1)

sharpens this constitutional picture: void debt begins exactly at the saturation limit, and

every later invariant and later axiom is effective rather than primitive. CF 00 then makes the

first orthogonal articulation mechanically explicit: the quarter-turn operator is algebraically

borne by i, while the half-turn completion/opening condition is measured by π. CF 14

shows that when temporal relation becomes admissible, the same rule reappears as a law

on endpoint-fixed admissible paths: continuation proceeds by the minimum admissible

accumulated orthogonal articulation required to keep the invariant borne without discharge.

This yields the stationarity condition δSI = 0, from which the Euler–Lagrange equations

follow as the local path-level non-discharge balance law. We then order the familiar variational

principles by dependency burden and derive them as realised descendants of the same root

law: Maupertuis’ principle, Hamilton’s principle, thermodynamic-potential extremisation,

Onsager’s dissipative principle, local field-action stationarity, gauge action stationarity,

gravitational action stationarity, Schwinger’s quantum action principle, the Feynman path

integral, and variational state-space descendants such as Rayleigh–Ritz and time-dependent

variational principles. Stationary action is therefore the temporal effective invariant of

minimum admissible orthogonal articulation