λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[sigma:Set].λ[r:∀[x:sigma].∀[y:sigma].Prop].λ[refr1:∀[x:sigma].(x).(x).r].λ[symr1:∀[x:sigma].∀[y:sigma].∀[t:(y).(x).r].(x).(y).r].λ[trr1:∀[x:sigma].∀[y:sigma].∀[z:sigma].∀[t:(y).(x).r].∀[u:(z).(y).r].(z).(x).r].λ[s:sigma].λ[t:sigma].λ[u:sigma].λ[usr:(u).(s).r].λ[utr:(u).(t).r]}.<(t).(s).r>.{({(utr).(u).(t).(trr1).(symr1).(refr1).(r).(sigma)}.symr).(usr).(t).(u).(s).(trr1).(symr1).(refr1).(r).(sigma)}.trr 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")