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Introductory Logic- terms from Introduction. Sorry for any typos- keybord actting up.


Is the science and art of reasoning well.

The Law of Excluded Middle

Any statement is either true of false.

The Law of Identity

If a statement is true, then it is true.

The Law of Non-contradiction

A statement cannot be both true and false.

Formal Logic

Deals with the proper modes of reasoning

Informal Logic

Deals with operations of thinking that are indirectly related to reasoning.


Is reasoning with probability from examples or experience to general rules.


is reasoning with certainty from premises to conclusions.

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