GATE (Graduate Aptitude Test in Engineering) Philosophy (XH-C4) Classical and Modern Western Philosophy-Logic Study Material (Page 11 of 23)

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The Three Laws of Thought, the Law of Principle of Identity, Non-Contradiction and Excluded Middle

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The Three Laws of Thought
  • Logic is defined as the science of the laws of thought.
  • Or, it can be understood as the study which deals with laws of thought.
  • There are three laws of thought which are most basic and most fundamental in nature.
  • Their use is necessary and a sufficient condition for correct thinking.
  • The three laws are;
  • The Law of principle of Identity
  • The Law of principle of non-contradiction
  • The Law of principle of excluded-middle

The Law of Principle of Identity

  • According to the law of principle of Identity, if any statement is true,…

… (433 more words, 19 figures) …

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Truth Connectives, Conditional or if … then, Bi-Conditional or “if and Only if”

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There are four truth-functional connectives. They are;

  • Conjunction or “And”
  • Disjunction or “Or”
  • Conditional or “If … then”
  • Bi-conditional or “If and only if”

Conditional or if … Then

  • Conditional statements are those statements where the word “if” and “then” are inserted within the…

… (585 more words) …

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