Removed proof of Suc_le_D (already proved in Nat.thy).
Removed proof of Suc_le_D (already proved in Nat.thy).

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle