importproveit# Prepare this notebook for defining the axioms of a theory:%axioms_notebook # Keep this at the top following 'import proveit'.
Defining axioms for theory 'proveit.logic.booleans.negation'
Subsequent end-of-cell assignments will define axioms
%end_axioms will finalize the definitions
Implicit in the following set of axioms is that $\lnot A$ is in Boolean iff
$A$ is in Boolean. Otherwise, $\lnot A$ is simply undefined.