λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[x1:nat].λ[x2:nat].λ[y1:nat].λ[y2:nat]}.<{({({(y2).(y1)}.fr).({(x2).(x1)}.fr)}.pf).({({(y2).(x2)}.ts).({({(x2).(y1)}.ts).({(y2).(x1)}.ts)}.pl)}.fr)}.eq>.{({(y2).(y1).(x2).(x1)}.pf12).({({(y2).(x2)}.ts).({({(x2).(y1)}.ts).({(y2).(x1)}.ts)}.pl)}.fr).({({(y2).(y1)}.fr).({(x2).(x1)}.fr)}.pf)}.refeq2 Validation parameters: sort hierarchy = "Z2", kernel options = ""
Last update: Sat, 12 Dec 2020 10:46:54 +0100
![[Spacer]](http://helm.cs.unibo.it/lambdadelta/images/rainbow.png "\lambda\delta rainbow rule")
![[Generated from XML via XSL]](http://helm.cs.unibo.it/lambdadelta/images/xml_xsl2.png "Generated from XML via XSL")
![[PNG used here]](http://helm.cs.unibo.it/lambdadelta/images/PNGnow2.png "PNG used here")
![[Viewable with any browser]](http://www.anybrowser.org/campaign/bvgraphics/abtfile.png "Viewable with any browser")