[離散] complemented lattice
let (L, ≦) be a complemented lattice
if x,y屬於L, we define x*y as the least upper bound of {x,y}
then * is a binary operation on L
which of the following statements are ture?
(a) (L,*) is a group
(b) (L,*) is a monoid but not a group
(c) (L,*) is not a monoid
原始: http://ppt.cc/~rOG
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