📘 Chapter 2: Entropy and Reversibility
In traditional physics, time is external — a parameter we move through.
But in URFT, time emerges only after a system begins to contain change.
This lesson introduces URFT’s formal definition of age and shows how systems accumulate reversible and irreversible change — forming the basis for entropy, decay, and eventual collapse.
🔹 Section 1: Age Emerges from Change
In URFT, time isn’t something you pass through — it’s something that builds as a system interacts with ripples. A system has no age until it echoes a ripple.
From that moment forward, its age is defined as:
• ∑R = reversible changes
• ∑I = irreversible changes (entropy)
Age(S) = ∑R + ∑I
These two terms reflect memory and transformation:
∑R captures interactions that can be undone or perfectly inverted.
∑I tracks decay, entropy, and irreversible ripple loss.
🔹 Section 2: Why This Matters in URFT
Age is local, not universal — it depends on the system’s own containment and interaction history.
Time is not external — it doesn’t flow. It grows with experience.
Entropy is not disorder — it’s irreversible echo memory.
This approach removes the need for external time dimensions and allows age to be simulated from interaction alone.
🔹 Section 3: Simulation Recap
In URFT simulations:
Ripple activity increases ∑R
When containment can’t fully rebound the ripple, ∑I grows
This transition marks irreversibility — the beginning of entropy
A system's age accelerates only after its echo begins to decay.
Key Takeaways
A system is only born when it echoes.
Time in URFT is measured, not assumed.
Entropy is encoded as irreversible rebound — not randomness.
