In my homework problem I shall proof the distributive law for logical statements. However instead of the equivalence arrow "$\Leftrightarrow$" the equal sign was used to state the problem. But I thought it's wrong to use "$=$" in a logical statement.
The following was stated:
Proof the following distributive law for statments A,B,C:
$A\wedge(B\vee C)=A\wedge B\vee A\wedge C$