zero-force evolutionary law

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 Zero-Force Evolutionary Law is the null expectation that diversity and function-free structural complexity tend to increase on average in systems with variation and heredity when no forces or constraints act specifically on those variables. RB1 distinguishes differentiation from adaptation: the law does not explain usefulness or maintained functional organization, and it is neither an absence of all physical forces nor the Second Law of Thermodynamics.

Explanation

The direct account attributes the law to McShea and Brandon and treats diversity and differentiation as variance-like measures. Independent heritable changes provide more ways for initially similar parts or lineages to diverge. This is a probabilistic average or baseline, not a claim that every pair becomes more different at every step.

The contrast between snail cases specifies what zero force means: different selective histories can yield divergence without selection for disparity itself, whereas competition directly favoring reduced overlap is selection on divergence. Thus the null condition concerns the measured variable rather than the impossible elimination of chemistry, interactions or all evolutionary processes.

RB1 places function-specific retention alongside this null background rather than identifying them. It also explicitly rejects collapsing the law into thermodynamic entropy because the measures are level-relative and probability-based. RB3’s comparison to asymmetric diffusion supplies a related formal intuition, not a teleological drive or universal guarantee of increasing adaptive sophistication.

Scope and attribution

Keep heredity, average tendency, variable-specific constraints and the nonfunctional measure explicit.

AB — The Actual Book

Native notes place ZFEL among related but distinct formal accounts.

Occurrence locators: Notes: 239.

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

The variable-specific null condition separates structural divergence, selection for disparity and adaptation.

Occurrence locators: 223, 224, 225, 226, 229, 267.

RB3 — The Real Book, Volume III: Murmurations

Independent heritable variation and asymmetric diffusion support a non-goal-directed statistical comparison.

Occurrence locators: 41, 42.

Background used in the editorial explanation

Named theories and mechanisms are distinguished from neighboring background, homonyms and the author’s own synthesis. Reproduced AI passages retain their separate voice.