Nuprl - hol_arithmetic_5 LEMMAs for sub_left

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Theorem	Name
Thm* m,n,x:. m+nnsub(n;x) = if nx then m else nnsub(m+n;x) fi	[sub_left_add]
cites the following:
Thm* all Thm* (m:hnum. all Thm* (m:hnum. (n:hnum. all Thm* (m:hnum. (n:hnum. (p:hnum. equal Thm* (m:hnum. (n:hnum. (p:hnum. (add(m,sub(n,p)) Thm* (m:hnum. (n:hnum. (p:hnum. ,cond(le(n,p),m,sub(add(m,n),p))))))	[hsub_left_add]

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html