What is Life?
Top resolved life result and likely the flagship E2 entry page.
Overview
“What is life?” is one of the oldest and most persistent questions in science and philosophy. Every classical definition — Aristotle’s soul, Schrödinger’s negentropy, NASA’s “self-sustaining chemical system capable of Darwinian evolution” — captures a necessary condition but none is sufficient. Fire metabolizes. Mules don’t reproduce. Crystals grow. Computers process information.
Book VI provides a categorical definition of life from which seven empirical hallmarks follow as theorems, not axioms.
Why It Is Hard
The difficulty is twofold: (1) life resists extensional definition because every candidate criterion admits counterexamples (viruses evolve but aren’t self-sustaining; fire is self-sustaining but not alive), and (2) no framework has unified the disparate hallmarks (metabolism, reproduction, homeostasis, growth, response, adaptation, organization) into a single structural principle from which all seven follow.
Panta Rhei Stance
Life is defined as a τ-Distinction carrier: an object in E₂ (the life enrichment layer) that maintains a boundary (the lemniscate L = S¹ ∨ S¹ realized as a lipid bilayer membrane), sustains Poincaré circulation (metabolism), and preserves a normal-form address across time (identity). The seven hallmarks — metabolism, reproduction, homeostasis, growth, response to stimuli, adaptation, and cellular organization — are derived as theorems from this single categorical definition (VI.T-series).
The definition is not a list of properties but a structural characterization: life is what happens when the τ-Distinction is physically instantiated at E₂.
Result Statement
Life is categorically defined as a τ-Distinction carrier at enrichment level E₂. Seven empirical hallmarks follow as theorems. The definition resolves the extensional problem: viruses fail (no autonomous boundary), fire fails (no normal-form persistence), crystals fail (no Poincaré circulation). Status: Resolved.