S pecial Lattice am dle Given a poset<(,a, b,c, 1, R>described in following figure Figure: Complemented LatticeSpecial Lattice Example Given a poset < {0, a, b, c, 1}, R > described in following figure. a b c 1 0 Figure: Complemented Lattice. Yi Li (Fudan University) Discrete Mathematics March 6, 2012 10 / 1