theorem Th10: :: YELLOW11:10

for L being LATTICE holds
( ex K being full Sublattice of L st M_3 ,K are_isomorphic iff ex a, b, c, d, e being Element of L st
( a <> b & a <> c & a <> d & a <> e & b <> c & b <> d & b <> e & c <> d & c <> e & d <> e & a "/\" b = a & a "/\" c = a & a "/\" d = a & b "/\" e = b & c "/\" e = c & d "/\" e = d & b "/\" c = a & b "/\" d = a & c "/\" d = a & b "\/" c = e & b "\/" d = e & c "\/" d = e ) )