Operational Scheme of the Autonomous Living System
0. Discriminating condition
A system is alive only if it actively produces the operations that keep it far from equilibrium. Being out of equilibrium is not sufficient. The decisive difference concerns the origin of that state.
Nonliving dissipative systems exhibit imposed nonequilibrium. Their form is determined by external flows, and their organization depends directly on environmental constraints.
Living systems exhibit produced nonequilibrium. Their structure is generated and regenerated by their own operations, in an oriented and constrained manner.
The discriminating criterion can therefore be stated as follows. Oriented self production, in the sense of autopoiesis, with strong autonomy.
1. The core: self production and organizational autonomy
The core of the living is defined by the capacity to produce and maintain an operational identity.
The living system generates its own components, regenerates the relations that connect them, and maintains an organizational closure. This closure does not mean isolation from flows. It means that internal operations refer, directly or indirectly, to the production and reproduction of the organization that constitutes the system.
The central function is to prevent two spontaneous tendencies. Entropic dissipation and structural disintegration.
2. The three maintenance operators: O, R, I
Three operators structure the maintenance of the living. They are concurrent, co determining and mutually enabling. None is sufficient alone, and each modifies how the others can operate.
2.1 Organization (O)
Organization includes morphogenesis, plasticity and organizational closure.
Its operational functions are the generation of a coherent functional topology, including compartments, gradients and networks. It ensures regeneration of degraded structures. It also allows adjustment of form without loss of function.
The relevant indicator is functional robustness despite structural variability.
2.2 Resilience (R)
Resilience corresponds to homeorhesis and adaptive margin.
Its operational functions are absorption of perturbations, redirection of dynamics toward a viable trajectory rather than a fixed point, and maintenance of a distance from catastrophic bifurcation thresholds.
The relevant indicator is the maximal perturbation amplitude that can be absorbed, often modeled as the size of the basin of attraction.
2.3 Integration (I)
Integration refers to global coherence and subordination of parts to the operational whole.
Its operational functions are coordination of subsystems, prevention of fragmentation, prevention of local dominance such as cancer like dynamics, and maintenance of operational unity.
The relevant indicator is the degree of causal integration between subsystems.
3. Dynamic maintenance loop
The living can be understood as a dynamic maintenance loop with two simultaneous properties.
The loop is thermodynamically open. Constant flows of matter and energy cross the system and are necessary to maintain nonequilibrium.
The loop is operationally closed. Operations refer back to the production of the system and sustain themselves as a network of active constraints.
This loop never closes in the sense of stopping. Its continuous nonclosure is the very condition of the living.
4. Modes of collapse: pathologies of the living
Collapse modes can be described as pathologies of the three operators.
4.1 Frozen organization
When organization becomes rigid, plasticity is lost. Hyperspecialization can produce inability to track slow environmental changes. Extinction then occurs through structural mismatch.
4.2 Insufficient resilience
When resilience is too weak, perturbation exceeds the bifurcation threshold. Collapse, cell death or systemic shock follows. Extinction occurs through dynamical rupture.
4.3 Failed integration
When integration degrades, fragmentation appears. The system can shift toward internal parasitism or uncontrolled proliferation. Extinction occurs through loss of operational unity.
5. Operational criterion of the living
The operational definition can be condensed into a single formulation designed for maximal precision.
A system is alive if it actively produces and maintains, through its own operations, an autonomous organization that keeps it far from thermodynamic equilibrium while preventing its spontaneous dissipation and disintegration.
This formulation captures self production, autonomy, simultaneous opposition to entropy and fragmentation, and produced rather than imposed nonequilibrium.