# Relation

> This node sits on the Substrate layer. Its mathematical type is graph. The Ontogenesis models build on it.

Record: `reasoning:substrate-node-relation`
Kind: substrate-node
Canonical: https://banes-lab.com/ontology/reasoning#reasoning-substrate-node-relation

Listed in [Reasoning records](https://banes-lab.com/api/records/reasoning.md), after [Difference](https://banes-lab.com/records/reasoning/substrate-node-difference.md) and before [Structure](https://banes-lab.com/records/reasoning/substrate-node-structure.md).

## Layer

- [Substrate](https://banes-lab.com/records/reasoning/layer-substrate.md)

## Math type

- [graph](https://banes-lab.com/records/reasoning/math-type-graph.md)

## Concept

- [Relation](https://banes-lab.com/records/reasoning/dimension-relation.md)

## Sequence of

- [Ontogenesis](https://banes-lab.com/records/reasoning/model-ontogenesis.md)

## Linked from

- [The models](https://banes-lab.com/ontology/reasoning/the-models.md)
- [The maps](https://banes-lab.com/ontology/reasoning/the-maps.md)