L8A

     00:00 Review of partial order

     01:45 Total order

     04:10 Examples

     15:40 Poset

     17:05 Maximal and minimal element

L8B

     00:00 Greatest and least element

     01:30 Example

     06:45 Lower bound and upper bound

     09:00 Greatest lower bound and least upper bound

     10:30 Example

     15:30 Lattice

     16:30 Example