# Invariant

> What remains unchanged?

Record: `reason:lens-invariant`
Kind: lens
Canonical: https://banes-lab.com/ontology/reasoning#reason-lens-invariant

## math-fields

- symmetry
- [topology](https://banes-lab.com/records/reason/math-type-topology.md)

## universal-axis

- [arrangement](https://banes-lab.com/records/reason/universal-axis-arrangement.md)

## referenced-by

- [Arrangement](https://banes-lab.com/records/reason/universal-axis-arrangement.md)