Encyclopedia > Disjunction introduction

  Article Content

Disjunction introduction

Disjunction introduction is the principle that, if A is true, then it's true that either A or B is true.

For example, if it's true that it's raining outside, it's trivially true[?] that either it's raining outside, or my car is freshly waxed. Since a disjunction is true if at least one of the terms is true, and we know that one of the terms is true, the second term is irrelevant for determining the truth value of the disjunction.


  ∴ ( A ∨ B )

See also: logical disjunction

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

... the state, could be charged for. If this advice were followed, the term commodity would still apply in human life analysis, or narrow domains such as relatively safe food ...