λδ digital library (LDDL)
Constant
![[butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png "\lambda\delta butterfly")
Informal description: ""
{λ[a:Prop].λ[b:Prop].λ[c:Prop].λ[i:{(b).(a)}.iff].λ[o:{(a).(c)}.orec]}.<{(b).(c)}.orec>.{({({(o).(a).(c)}.orece2).(i).(c).(b).(a)}.thec2).({({(o).(a).(c)}.orece1).(i).(c).(b).(a)}.thor2).(b).(c)}.oreci 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")