Step 
*
 of Lemma 
sg-reachable_wf
∀[g:SimpleGame]. ∀[x,y:Pos(g)].  (sg-reachable(g;x;y) ∈ ℙ)
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[g:SimpleGame].  \mforall{}[x,y:Pos(g)].    (sg-reachable(g;x;y)  \mmember{}  \mBbbP{})
 By 
Latex:
ProveWfLemma
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