Rule of Conjunction/Proof Rule

Proof Rule
The Rule of Conjunction is a valid deduction sequent in propositional logic.

As a proof rule it is expressed in the form:
 * If we can conclude both $\phi$ and $\psi$, we may infer the compound statement $\phi \land \psi$.

It can be written:
 * $\displaystyle {\phi \qquad \psi \over \phi \land \psi} \land_i$

Also see

 * Rule of Simplification