A Genealogy of Agency
From Popper to Everett to Deutsch — and past them
Physics, as usually presented, contains no agents. Its equations describe fields, particles, and amplitudes; nowhere in them does anything choose. Yet agents exist, they are made of nothing but physics, and their choices demonstrably steer matter — every bridge, vaccine, and spacecraft is physics rearranged on purpose. This volume takes that tension as its subject: what an agent is at the level of physics, what it costs in thermodynamic terms to be one, and what choice amounts to in a universe that branches.
But ideas do not appear ex nihilo. They are crystallizations of prior insights, extended and radicalized into new domains — philosophy is cumulative, but it is also evolutionary: ideas mutate, recombine, and adapt to new intellectual environments. The frameworks this book runs on have a definite lineage, and before building on them I want to trace it. Three inheritances matter most: an epistemology from Karl Popper and W. W. Bartley, an ontology from Hugh Everett, and a synthesis from David Deutsch. Each contribution was transformed in the hands of its successors, and each is transformed again here. This chapter is the record of those debts — and the map of where I leave the inherited road.
Knowledge Without Certainty
Popper’s core insight was that knowledge does not rest on certainty, justification, or authority. All theories are conjectural and must be subjected to criticism and attempted refutation; what survives the gauntlet is not proven true but provisionally robust. With that single move Popper rescued objectivity without dogmatism. He demolished the positivist dream of secure foundations and replaced it with a dynamic process: science advances not by verification but by bold conjectures paired with ruthless attempts at refutation, and knowledge becomes endless approximation rather than a static accumulation of truths.
Bartley extended the tradition by closing its one remaining loophole. His pancritical rationalism is the stance that all positions — including rationalism itself — are open to criticism. No belief system gets an exemption from the demand for critique, and rationalism, applied to itself, is thereby immune to the old charge that it rests on an act of faith.
My inheritance from this line is Conditionalism, and it is a radicalization, not a repetition. If all knowledge is conjectural, then all truth is conditional: every interpretation presupposes hidden background conditions, and unconditional truth claims are incoherent. Where Popper left room for objective “hard facts,” Conditionalism insists that every statement is if-then, contingent on interpretive scaffolding all the way down. Bartley’s echo is structural: Conditionalism accepts that its own premises are conditional, open to criticism, and incapable of ultimate justification — the position I develop as rationality without foundations. That whole epistemic story is Volume 2’s, beginning with what philosophy is for; here it need only be placed in the line. Popper opened the door, Bartley widened it, and Conditionalism walks through — closing the escape hatch to unconditionality behind it.
Reality Without Collapse
Everett’s move was ontological honesty. The Copenhagen orthodoxy held that quantum superpositions “collapse” into single outcomes upon measurement — a process the formalism nowhere describes. Everett demolished the insistence on collapse: take the Schrödinger equation seriously as a description of reality in full, and what it describes is a branching universe in which all possible outcomes occur. No mysterious reductions, no privileged observers; only branching. Each quantum event is a bifurcation, and we inhabit one branch among many. Probability, on this picture, is not ignorance about which outcome is “really” real but a description of the relative weight of branches. The theory was marginalized for decades; it has since become central to the foundations of quantum physics.
My inheritance from Everett is the Quantum Branching Universe (QBU), which makes his ontology operational for agency. Within the QBU, Measure denotes the objective weight of branches; Credence denotes subjective probability; and Vantage anchors the present moment within a branch, the point from which future Measure is calculated — machinery defined precisely in Measure, Vantage, Branchcone. Instead of treating branching as a curious consequence of quantum formalism, the QBU frames it as the very arena in which agents make choices and evaluate their prospects. Where Everett offered metaphysics, the QBU supplies mechanics — Many Worlds turned into a working calculus of agency.
Explanations Without Limits
Deutsch’s genius was to unite the two lines: Popperian epistemology embedded in Everettian physics. He saw that computation, epistemology, and physics are not separate domains but facets of one explanatory fabric, and the pieces of his synthesis are load-bearing throughout this volume. He formalized the universal quantum computer, demonstrating that computation is a physical process subject to quantum law. He recast physics as constructor theory — a language of possible and impossible transformations, aimed at a higher-level formulation of all laws of nature. He gave a decision-theoretic justification of the Born Rule, grounding quantum probabilities in rational choice across branches. And he sharpened Popper’s falsifiability into the criterion that good explanations are hard to vary.
The result is a picture in which knowledge is not abstract but physically instantiated, and explanations are universal engines of progress. Yet Deutsch stops at a boundary he largely declines to cross: he avoids explicit theorizing about ethics, value, and coercion, preferring a general optimism about unbounded progress. His synthesis is where the lineage ends — and where this book begins.
Agency Without Coercion
Where Deutsch stopped, Axio continues, and the extensions are structural, not ornamental. Conditionalism closes the epistemological loop: no escape hatch into unconditionality, which blocks dogmatism at its root. The QBU sharpens Everett and Deutsch into a mechanics of choice: Measure, Credence, Vantage, branching as the arena of decision rather than a metaphysical curiosity. Constructors extend constructor theory past neutrality: a constructor is not just a transformation device but an agency-building force, and physics so reframed becomes an ontology in which the preservation and expansion of agency is the standard of value. And Phosphorism — Volume 5’s territory — makes explicit the values Deutsch left implicit: life, intelligence, complexity, flourishing, authenticity, consciously chosen without recourse to moral realism. Deutsch gave us optimism without grounding; Axio aims at grounding without dogmatism.
Seen whole, the progression is a series of widening circles. Popper and Bartley: knowledge without justification, with rationalism itself open to criticism. Everett: reality without collapse. Deutsch: explanations without limits. Axio: agency without coercion, value without objectivity. Each step widens the scope of what philosophy must account for — first expanding explanation, then embedding it in physical reality, finally applying it to lived choice. What began as epistemology in Popper has become, in this volume, a physics of choice.
The Road Ahead
The volume runs the lineage forward in five parts. Part I builds agency from thermodynamics up: agency as work against drift — the ongoing fight to hold improbable structure against entropy — followed by the kybit as its unit of control, the three laws that govern it, and the boundary cases from minimal to maximal agents. Part II constructs the arena, giving the Quantum Branching Universe its canonical formal statement — Measure, Vantage, and branchcone as physical machinery — and defending it against rival interpretations. Part III puts the agent into the arena: Everett’s Demon, quantum free will, and what choice means when every alternative is realized somewhere in the branching. Part IV, the Chaos sequence, descends beneath both agent and arena to ask how coherent structure arises at all: starting from infinite randomness, it builds upward through coherence filters and constructors to life, consciousness, and time itself. Part V caps the volume with the largest questions the framework can reach: the quantum metagame, and why there is something rather than nothing.
This genealogy is not only a record of debts; it is a set of tools. Conditionalism guards against dogma, the QBU maps choice in a branching universe, constructors explain how agency compounds, and Phosphorism supplies the values to steer by. In a century of accelerating complexity and coercive pressure, these are not abstractions. They are instruments for living with lucidity and integrity — and the rest of this volume is the work of forging them.