Hasse diagrams

A Hasse diagram is a visual way to represent relationships of order among items, such as hierarchy or set inclusion. In the diagram, each item is a point, and lines connect items to show a direct "cover" relationship—meaning there's no intermediate item between them. Items higher up are considered "greater" or "above" others, and the diagram provides a clear picture of how all pairs relate in terms of ordering, making complex hierarchical structures easier to understand at a glance. It's commonly used in mathematics and computer science to illustrate ordering systems.