axiom nle_nplus_comp: \forall x1, x2, x3. (x1 + x2 == x3) \to
\forall y1, y2, y3. (y1 + y2 == y3) \to
x1 <= y1 \to x2 <= y2 \to x3 <= y3.
axiom nle_nplus_comp: \forall x1, x2, x3. (x1 + x2 == x3) \to
\forall y1, y2, y3. (y1 + y2 == y3) \to
x1 <= y1 \to x2 <= y2 \to x3 <= y3.