Theorem falbitru

A <-> identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.) (Proof shortened by Wolf Lammen, 10-Jul-2020.)

Conclusion
\( \vdash \bot \leftrightarrow \top \leftrightarrow \bot \)
Proof
tbtru
bicomi _