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15 set "baseuri" "cic:/matita/RELATIONAL/NLE/nplus".
17 include "NLE/defs.ma".
19 axiom pippo: \forall x1, x2, x3. (x1 + x2 == x3) \to
20 \forall y1, y2, y3. (y1 + y2 == y3) \to
21 x1 <= y1 \to x2 < y2 \to x3 < y3.