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ExamplesFirst OrderIdentity for addition

Existence of an identity element for addition

Logoident.lf
nat : type. z : nat. s : {x:nat} nat. plus : {N1:nat}{N2:nat}{N3:nat} type. plus_z : {N:nat} plus z N N. plus_s : {N1:nat}{N2:nat}{N3:nat} {P:plus N1 N2 N3} plus (s N1) N2 (s N3).
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