== Unit+Unit+Unit 
Type
== inl(
) 
== inr(inl()) 
== inr(inr()) 
P
A:Prop. Dec(A) PropA == A 
FalseA:Prop. (A) Prop| Who Cites Three? | |
| Three | Def == Unit+Unit+Unit |
| Thm* Type | |
| Three_0 | Def 3 == inl() |
| Thm* 3 | |
| Three_1 | Def 3 == inr(inl()) |
| Thm* 3 | |
| Three_2 | Def 3 == inr(inr()) |
| Thm* 3 | |
| decidable | Def Dec(P) == P P |
| Thm* A:Prop. Dec(A) Prop | |
| not | Def A == A False |
| Thm* A:Prop. (A) Prop |
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