A1: 81 = (0 * 257) + 81 ;
thus (3 |^ 4) mod (Fermat 3) = (3 |^ (2 + 2)) mod (Fermat 3)
.= ((3 |^ 2) * (3 |^ 2)) mod (Fermat 3) by NEWTON:8
.= (((3 |^ 2) mod (Fermat 3)) * ((3 |^ 2) mod (Fermat 3))) mod (Fermat 3) by NAT_D:67
.= 81 by A1, Lm25, Th53, NAT_D:def 2 ; :: thesis: verum