9. Let S = {{a}, {b}, {c}, {a, b}, {a, c}, {b, c}}. Construct the Hasse diagram for (S, C).
9. Let S = {{a}, {b}, {c}, {a, b}, {a, c}, {b, c}}. Construct the Hasse diagram for (S, C).
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:**Problem 9:**
Let \( S = \{ \{a\}, \{b\}, \{c\}, \{a, b\}, \{a, c\}, \{b, c\} \} \). Construct the Hasse diagram for \((S, \subseteq)\).
**Explanation:**
This problem asks you to construct a Hasse diagram for the set \( S \) with the relation of subset \(\subseteq\). A Hasse diagram represents a finite partially ordered set, where elements are represented as vertices and the order relation is represented by edges without drawing all the transitive relations. Generally, the diagram is drawn in such a way that smaller elements are placed lower than the larger elements with respect to the partial order.
To construct the Hasse diagram for this set:
1. The elements of the set \( S \) are individual sets: \(\{a\}\), \(\{b\}\), \(\{c\}\), \(\{a, b\}\), \(\{a, c\}\), and \(\{b, c\}\).
2. The inclusion \(\subseteq\) defines the order, so each single element set is related to the two-element sets that contain it.
3. Connect \(\{a\}\) to both \(\{a, b\}\) and \(\{a, c\}\).
4. Connect \(\{b\}\) to both \(\{a, b\}\) and \(\{b, c\}\).
5. Connect \(\{c\}\) to both \(\{a, c\}\) and \(\{b, c\}\).
6. Place \(\{a, b\}\), \(\{a, c\}\), and \(\{b, c\}\) higher up in your diagram than \(\{a\}\), \(\{b\}\), and \(\{c\}\) respectively.
The resulting Hasse diagram will visually capture the subset relations among the elements of \( S \).
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