λδ digital library (LDDL)
Constant
![\lambda\delta butterfly [butterfly]](http://helm.cs.unibo.it/lambdadelta/images/b5.png)
Informal description: ""
{λ[a:Prop].λ[b:Prop].λ[a1:a].λ[b1:b]}.<{(b).(a)}.iff>.{(λ[x:b].a1).(λ[x:a].b1).(b).(a)}.iffi Validation parameters: sort hierarchy = "Z2", kernel options = ""
Last update: Sat, 12 Dec 2020 10:46:54 +0100