λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[x0:rat].λ[y0:rat].λ[alpha:Set].λ[f:Π[x:frac].Π[y:frac].alpha].λ[ff:{(f).(alpha)}.fixf].λ[x:frac].λ[y:frac].λ[xix0:{((x0).class).(x)}.inf].λ[yiy0:{((y0).class).(y)}.inf]}.<{({(ff).(f).(alpha).(y0).(x0)}.indrat).((y).(x).f).(alpha)}.is>.{(yiy0).(y).(xix0).(x).(y0).(x0).(ff).(f).(alpha).(treq).(symeq).(refeq).(eq).(frac)}.th1 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")