T1 |- P->P
T2 |- P v ~P
T3 |- ~(P & ~P)
T4 |- P->(Q->P)
T5 |- (P->Q) v (Q->P)
T6 |- P <-> ~~P
T7 |- (P <-> Q) <-> (Q <->
P)
T8 |- ~(P <-> Q) <-> (~P
<-> Q)
T9 |- ((P->Q)->P)->P
T10 |- (P->Q) v (Q->R)
T11 |- (P <-> Q) <-> (~
P <-> ~Q)
T12 |- (~P->Q) & (R->Q)
<-> (P->R)->Q
T13 |- P <-> P & P
T14 |- P <-> P v P
T15 |- (P <-> Q) & (R
<-> S)->((P->R) <-> (Q->S))
T16 |- (P <-> Q) & (R
<-> S)->(P & R <-> Q & S)
T17 |- (P <-> Q) & (R
<-> S)->(P v R <-> Q v S)
T18 |- (P <-> Q) & (R
<-> S)->((P <-> R) <-> (Q <-> S))
T19 |- (P <-> Q)-> ((R->P)
<-> (R->Q)) & ((P->R) <-> (Q->R))
T20 |- (P <-> Q)->(R &
P <-> R & Q)
T21 |- (P <-> Q)->(R v P <->
R v Q)
T22 |- (P <-> Q)->((R <->
P) <-> (R <-> Q))
T23 |- P & (Q <-> R)->(P
& Q <-> R)
T24 |- P->(Q->R) <-> ((P->Q)->(P->R))
T25 |- P->(Q->R) <-> Q->(P->R)
T26 |- P->(P->Q) <-> P->Q
T27 |- (P->Q)->Q <-> (Q->P)->P
T28 |- P->~Q <-> Q->~P
T29 |- ~P -> P <-> P
T30 |- (P & Q) v (R &
S) <-> ((P v R) & (P v S)) & ((Q v R) & (Q v S))
T31 |- (P v Q) & (R v S)
<-> ((P & R) v (P & S)) v ((Q & R) v (Q & S))
T32 |- (P->Q) & (R->S) <->
((~P & ~R) v (~P & S)) v ((Q & ~R) v (Q & S))
T33 |- (P v ~P) & Q <->
Q
T34 |- (P & ~P) v Q <->
Q
T35 |- P v (~P & Q) <->
P v Q
T36 |- P & (~P v Q) <->
P & Q
T37 |- P <-> P v (P &
Q)
T38 |- P <-> P & (P v
Q)
T39 |- (P->Q & R) -> (P &
Q <-> P & R)