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15 set "baseuri" "cic:/matita/RELATIONAL/ZEq/defs".
17 include "datatypes/Zah.ma".
18 include "NPlus/defs.ma".
20 inductive ZEq: Zah \to Zah \to Prop :=
21 | zeq: \forall m1,m2,m3,m4,n.
22 (m1 + m4 == n) \to (m3 + m2 == n) \to
23 ZEq \langle m1, m2 \rangle \langle m3, m4 \rangle
26 interpretation "integer equality" 'eq x y =
27 (cic:/matita/RELATIONAL/ZEq/defs/ZEq.ind#xpointer(1/1) x y).