# Existence

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

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

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

## Layer

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

## Math type

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

## Grounded by

- [ADD](https://banes-lab.com/records/pag/keyword-action-add.md)
- [APPEND](https://banes-lab.com/records/pag/keyword-action-append.md)
- [GENESIS](https://banes-lab.com/records/pag/keyword-node-genesis.md)
- [node_meta_tag](https://banes-lab.com/records/pag/production-node-meta-tag.md)

## Sequence of

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

## Concept of

- [Existence](https://banes-lab.com/records/reasoning/universal-axis-existence.md)

## Linked from

- [The models](https://banes-lab.com/ontology/reasoning/the-models.md)
- [action](https://banes-lab.com/ontology/grammar/pag-keywords-action.md)
- [node](https://banes-lab.com/ontology/grammar/pag-keywords-node.md)
- [planning](https://banes-lab.com/ontology/grammar/pag-productions-planning.md)