λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[y:nat].λ[l:{(y).(1)}.less].λ[f:Π[t:(1).1to].(y).1to]}.<({({(f).(l).(y)}.yy).({(f).(l).(y)}.1y).((y).1to)}.is).not>.{(λ[t:{({(f).(l).(y)}.yy).({(f).(l).(y)}.1y).((y).1to)}.is].{(t).(f).(l).(y)}.t1).({(f).(l).(y)}.t2).({(y).(1)}.is).({({(f).(l).(y)}.yy).({(f).(l).(y)}.1y).((y).1to)}.is)}.th3 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")