λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[a:Prop].λ[ksi:Set].λ[x:ksi].λ[y:ksi].λ[n:(a).not].λ[x1:ksi].λ[y1:ksi].λ[px1:{(x1).(y).(x).(ksi).(a)}.prop1].λ[py1:{(y1).(y).(x).(ksi).(a)}.prop1]}.<{({(y).(x1).(ksi)}.is).((a).not)}.imp>.{(px1).({({(y).(x1).(ksi)}.is).((a).not)}.imp).({({(x).(x1).(ksi)}.is).(a)}.imp)}.ande2 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")