Step * 1 1 1 1 of Lemma free-dl-1-join-irreducible


1. Type
2. eq EqDecider(T)
3. {ac:fset(fset(T))| ↑fset-antichain(eq;ac)} 
4. {ac:fset(fset(T))| ↑fset-antichain(eq;ac)} 
5. {} ∈ fset-ac-lub(eq;x;y)
⊢ {} ∈ x ∨ {} ∈ y
BY
RepUR ``fset-ac-lub`` -1 }

1
1. Type
2. eq EqDecider(T)
3. {ac:fset(fset(T))| ↑fset-antichain(eq;ac)} 
4. {ac:fset(fset(T))| ↑fset-antichain(eq;ac)} 
5. {} ∈ fset-minimals(xs,ys.f-proper-subset-dec(eq;xs;ys); x ⋃ y)
⊢ {} ∈ x ∨ {} ∈ y


Latex:


Latex:

1.  T  :  Type
2.  eq  :  EqDecider(T)
3.  x  :  \{ac:fset(fset(T))|  \muparrow{}fset-antichain(eq;ac)\} 
4.  y  :  \{ac:fset(fset(T))|  \muparrow{}fset-antichain(eq;ac)\} 
5.  \{\}  \mmember{}  fset-ac-lub(eq;x;y)
\mvdash{}  \{\}  \mmember{}  x  \mvee{}  \{\}  \mmember{}  y


By


Latex:
RepUR  ``fset-ac-lub``  -1




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