∀ n, n ≤ (n+1)

Theorem le_n_Sn : forall (n:nat), le n (S n).

theorem le_n_Sn : \forall (n:nat). (le) n ((S) n).

theorem le_n_Sn : forall (n:nat.nat) , (((nat.le_) ) (n)) (((nat.S) ) (n)).

le_n_Sn : LEMMA (FORALL(n:nat_sttfa.sttfa_nat):nat_sttfa.le(n)(nat_sttfa.sttfa_S(n)))

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