SeaShore’s Reviews > Being Logical: A Guide to Good Thinking > Status Update

Four principles of Logic:
1)Principle of Identity-- Tell what it is
2) Excluded Middle--It exists or doesn't exist. The lamp is on the desk or it isn't.
3)There is sufficient reason for everything.-Larry's mother and father are the cause of his very existence.
4) The Principle of contradiction.- He is physically in New York even though his thoughts are in Washington but he is not in both places at the same time.