functional-information arrow

Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion

Editorial synthesis · provisional

Definition

The functional-information arrow is RB2’s proposed direction of accumulated functionally effective organization in open evolving systems under selection. It is nested within, but distinct from, the thermodynamic arrow describing energetic cost and dispersal. The proposal retains specified function, configuration space and selective retention without treating mere complication as functional information or guaranteeing uninterrupted growth in every system.

Explanation

The account attributes the conditional claim to Wong and colleagues: varied configurations undergo selection for one or more functions. What persists must work within its environment, not merely possess many parts. AB similarly makes functional information a measure relative to a defined function and comparison space rather than the ontological ground of form-taking.

The thermodynamic arrow tracks costs and gradients, while functional-information accumulation concerns retained organization in open systems. The latter does not reverse the Second Law or stand outside material expenditure. It describes a distinct historical organization that can exploit what thermodynamic conditions make possible.

RB1 explicitly marks uneven empirical status, partly understood abiotic mechanisms and bounded mineral possibility spaces. RB2 permits information loss and collapse; AB calls the proposed law debated. The entry therefore preserves a conditional research claim without turning a comparative tendency into a universal monotonic measure or a doctrine of inevitable progress.

Scope and attribution

Retain LIFI attribution, specified function and empirical limitations.

AB — The Actual Book

Specified comparison conditions and debated status limit the measure.

Occurrence locators: Appendix: 271, 272.

RB1 — The Real Book, Volume I: The Possible Is Real

Abiotic bounds and empirical unevenness prevent unrestricted universalization.

Occurrence locators: 219, 267, 268.

RB2 — The Real Book, Volume II: Becoming Is Being

Selective functional accumulation is distinct from entropy and permits loss.

Occurrence locators: 221, 222, 223.