---
title: "world-induce-changes — Mova code model"
description: "Mova code model of world/src/induce.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/induce.rs.groupant/changes.groupant/"
---
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# world-induce-changes

The groupant beside world/src/induce.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

## Facts

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`world/src/induce.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/induce.rs)
- **source SHA-256:** `0297cbe15b922cb5…`
- **covers:** Add r appends iff r absent; Remove r filters all equal; Replace a,b maps every a in place. holds(Add r)=exists broader x covering r; holds(Replace)=old absent OR new present. (bytes 58143–59518)
- **part of:** [world-induce](https://md.groupants.elamur.ai/free/en/mova/world/src/induce.rs.groupant/)
- **repository folder:** [`world/src/induce.rs.groupant/changes.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/induce.rs.groupant/changes.groupant)
- **repository commit:** `855da7bd4a7b`

> **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

## Components

| component | label | where |
|---|---|---|
| **approximant** | partial | [approximant](#approximant) |
| **ast** | partial | `../syntax.json` |
| **composition** | partial | [composition](#composition) |
| **cost** | partial | [cost](#cost) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | partial bounded parent tests | [tests](#tests) |

## Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

| id | type | label | where |
|---|---|---|---|
| `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `world_induce_changes_invariants` | world_induce_changes_invariants | partial source derived model | [world_induce_changes_invariants](#world-induce-changes-invariants) |
| `world_induce_changes_resource_cost` | world_induce_changes_resource_cost | partial source derived model | [world_induce_changes_resource_cost](#world-induce-changes-resource-cost) |
| `world_induce_changes_representation_join` | world_induce_changes_representation_join | partial source derived model | [world_induce_changes_representation_join](#world-induce-changes-representation-join) |
| `world_induce_changes_domain_partition` | world_induce_changes_domain_partition | partial source derived model | [world_induce_changes_domain_partition](#world-induce-changes-domain-partition) |

## Model text


### descriptant

#### world-induce-changes

Add r appends iff r absent; Remove r filters all equal; Replace a,b maps every a in place. holds(Add r)=exists broader x covering r; holds(Replace)=old absent OR new present.

##### Modeling epoch 2026-10-31

Prospective source/branch/cost hypotheses were saved externally before source edits. This partial source-derived model retains observed boundaries rather than claiming complete verification. Pure codes/counting/parsing/changes/threshold tests; feature extraction, persistent effects and live learning remain partial, no surrogate.

### approximant

#### Forward relation

Add r appends iff r absent; Remove r filters all equal; Replace a,b maps every a in place. holds(Add r)=exists broader x covering r; holds(Replace)=old absent OR new present.

Domain: Finite Rule vectors including duplicate/empty atoms; semantic validity caller-owned.

No executable percent surrogate: these categorical/effect observations lack a useful approximation metric. Future supported caps1/2/5/10% need a defined domain/metric and real reference evidence; no error or speed bound is claimed.

### invariant

Caller vector immutable, order retained, multiplicity preserved by Replace; equality compares full atom vectors.

Cost component: [cost.md](https://md.groupants.elamur.ai/free/en/mova/world/src/induce.rs.groupant/changes.groupant/#cost).

### cost

O(R*A) equality/clones with no I/O/parser effects.

### composition

family apply_scoped adds scope preservation; broader holds is redundancy heuristic not inverse of apply.

### models

### behavior_complement

holds(Add r) true need not imply apply(Add r)=identity: broader unequal rule covers but exact append still occurs. Replace cannot reorder untouched rules.

### reverse_reconstruction

Remove fiber Y consists of lists deleting all r to Y. Replace chooses subset of resulting new positions with old antecedents, preserving others. Add output may come from identical already-containing list or prefix before final appended r.

### world_induce_changes_invariants

Caller vector immutable, order retained, multiplicity preserved by Replace; equality compares full atom vectors.

### world_induce_changes_resource_cost

O(R*A) equality/clones with no I/O/parser effects.

### world_induce_changes_representation_join

family apply_scoped adds scope preservation; broader holds is redundancy heuristic not inverse of apply.

### world_induce_changes_domain_partition

Finite Rule vectors including duplicate/empty atoms; semantic validity caller-owned.

### tests

#### Scoped evidence

Parent selected test names: ["induce::wave29_worldlearn::counting_requires_correct_heads_and_orders_candidates", "induce::wave29_worldlearn::packed_subsets_and_empty_bootstrap", "induce::wave29_worldlearn::permissive_parse_and_set_valued_changes"]. These finite tests touch only the named behaviors, not every statement in this fragment. See [parent evidence](https://md.groupants.elamur.ai/free/en/mova/world/src/induce.rs.groupant/#tests). control-induce: compiled source mutation failed with exit101; source restored byte-for-byte and15positive tests passed.

Scope bytes [58143,59518) are bound to the shared parent syntax projection and full source hash. Pure codes/counting/parsing/changes/threshold tests; feature extraction, persistent effects and live learning remain partial, no surrogate.