Theory for implication operations: Implies
($\Rightarrow$) and Iff
($\Leftrightarrow$). The Implies
operation has an antecedent
and a consequent
. For example, in $A \Rightarrow B$, $A$ is the antecedent
and $B$ is the consequent
. If an implication is true and the antecedent
is true (e.g., $A$), the consequent
must also be true (e.g. $B$). That is $B$ is true if $A$ is true. Iff
should be read "if and only if" and is defined to mean that the implication goes both ways. That is $A \Leftrightarrow B$ means $A \Rightarrow B$ and $B \Rightarrow A$.
import proveit
%theory