λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[r:real].λ[s:real].λ[t:real].λ[u:real]}.<{({({(u).(s)}.pl).({(t).(r)}.pl)}.mn).({({(u).(t)}.mn).({(s).(r)}.mn)}.pl)}.is>.{(λ[x:dif].λ[y:dif].λ[z:dif].λ[v:dif].λ[xi:{((r).class).(x)}.inn].λ[yi:{((s).class).(y)}.inn].λ[zi:{((t).class).(z)}.inn].λ[vi:{((u).class).(v)}.inn].{(vi).(zi).(yi).(xi).(v).(z).(y).(x).(u).(t).(s).(r)}.t2).({({({(u).(s)}.pl).({(t).(r)}.pl)}.mn).({({(u).(t)}.mn).({(s).(r)}.mn)}.pl)}.is).(u).(t).(s).(r)}.realapp4 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")