Electrical Engineering › Section S · Logic gates and Boolean algebra › Topic S.3

Boolean operations, laws, and DeMorgan's theorems

Boolean algebra is the arithmetic of logic circuits: a small set of laws and rules lets you rewrite any expression, and so any circuit, in a different but equivalent form. This topic states those laws, proves the less obvious rules, and shows how DeMorgan's theorems convert between AND and OR forms.

In this topic

  • Variables, literals and terms
  • The three laws
  • Rules with constants and repeats
  • Three rules that simplify
  • Worked example: proving a rule two ways
  • DeMorgan's theorems
  • Applying DeMorgan step by step
  • Worked example: a bar over a product
  • Worked example: a bar over a sum
  • Common mistakes to avoid
  • Key takeaways

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