i- Show that ∀� � → ∞ . �(�) cannot be long-tailed ? ii- Find � � → ∞ ∶ �(�) �� ℎ���� − ������ ∙ iii- Find � � → ∞ ∶ �(�) �� ���ℎ� − ������ ∙ iv- Can you find necessary and sufficient condition on {��} to be heavy tailed?