# Changes in version 2017.2.0¶

UFL 2017.2.0 was released on 2017-12-05.

## Summary of changes¶

• Add CellDiameter expression giving diameter of a cell, i.e., maximal distance between any two points of the cell. Implemented for all simplices and quads/hexes.
• Make (Min|Max)(Cell|Facet)EdgeLength working for quads/hexes

## Detailed changes¶

• Add geometric quantity CellDiameter defined as a set diameter of the cell, i.e., maximal distance between any two points of the cell; implemented on simplices and quads/hexes
• Rename internally used reference quantities (Cell|Facet)EdgeVectors to Reference(Cell|Facet)EdgeVectors
• Add internally used quantites CellVertices, (Cell|Facet)EdgeVectors which are physical-coordinates-valued; will be useful for further geometry lowering implementations for quads/hexes
• Implement geometry lowering of (Min|Max)(Cell|Facet)EdgeLength for quads and hexes