λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[x:nat].λ[y:nat].λ[z:nat].λ[u:nat].λ[i:{(y).(x)}.is].λ[j:{(u).(z)}.is]}.<{({(u).(y)}.ts).({(z).(x)}.ts)}.is>.{({(j).(y).(u).(z)}.ists2).({(i).(z).(y).(x)}.ists1).({(u).(y)}.ts).({(z).(y)}.ts).({(z).(x)}.ts).(nat)}.tris 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")