λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[alpha:Set].λ[p:(alpha).pair1type].λ[q:(alpha).pair1type].λ[i:{({(q).(alpha)}.first1).({(p).(alpha)}.first1).(alpha)}.is].λ[j:{({(q).(alpha)}.second1).({(p).(alpha)}.second1).(alpha)}.is].λ[u:(2).1to].λ[u1:{(1t).(u).((2).1to)}.is]}.<{({(p).(alpha)}.first1).((u).p).(alpha)}.is>.{(u1).(1t).(u).(p).(alpha).((2).1to)}.isf 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")