∀ n m, n ≤ ((n - m) + m)

Theorem le_plus_minus_m_m : forall (n:nat), forall (m:nat), le n (plus (minus n m) m).

theorem le_plus_minus_m_m : \forall (n:nat). \forall (m:nat). (le) n ((plus) ((minus) n m) m).

theorem le_plus_minus_m_m : forall (n:nat.nat) , forall (m:nat.nat) , (((nat.le_) ) (n)) ((((nat.plus) ) ((((nat.minus) ) (n)) (m))) (m)).

le_plus_minus_m_m : LEMMA (FORALL(n:nat_sttfa.sttfa_nat):(FORALL(m:nat_sttfa.sttfa_nat):nat_sttfa.le(n)(nat_sttfa.plus(nat_sttfa.minus(n)(m))(m))))

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