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Conjunction introduction is the inference that, if p is true, and q is true, then the conjunction p and q is true.
For example, if it's true that it's raining, and it's true that I'm inside, then it's true that it's raining, and I'm inside.
Formally:
<math>p\,\!<math>
<math>\frac{q\,\!\qquad\quad}{}<math>
∴<math>( p \wedge q )<math>
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