λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[sigma:Set].λ[s:sigma].λ[t:sigma].λ[u:sigma].λ[v:sigma].λ[w:sigma].λ[i:{(t).(s).(sigma)}.is].λ[j:{(u).(t).(sigma)}.is].λ[k:{(v).(u).(sigma)}.is].λ[l:{(w).(v).(sigma)}.is]}.<{(w).(s).(sigma)}.is>.{(l).({(k).(j).(i).(v).(u).(t).(s).(sigma)}.tr3is).(w).(v).(s).(sigma)}.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")