Nuprl - hol_arithmetic_4 LEMMAs for add_eq

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Theorem	Name
Thm* m,n:. m+n = 0 m = 0 & n = 0	[add_eq_0]
cites the following:
Thm* all Thm* (m:hnum. all Thm* (m:hnum. (n:hnum. equal(equal(add(m,n),0),and(equal(m,0),equal(n,0)))))	[hadd_eq_0]

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