Exercise · ZW-PARTIAL-ORDER-RELATION-007 · ★★☆ Intermediate
In \(\mathcal{P}(\{a,b\})\) under \(\subseteq\), how many pairs \((A,B)\) satisfy \(A\subsetneq B\)?
Choose one option.
Show answer
- D. 5
Explanation
\(\varnothing\) is contained in the other three, and \(\{a\}\), \(\{b\}\) are in \(\{a,b\}\): \(3+1+1=5\).
Review the concept: Partial order relation
A relation \(\preceq\) on a set \(S\) that is reflexive, antisymmetric and transitive, and therefore orders some pairs of elements of \(S\).
\[a\preceq a;\quad (a\preceq b\ \wedge\ b\preceq a)\Rightarrow a=b;\quad (a\preceq b\ \wedge\ b\preceq c)\Rightarrow a\preceq c\]
More practice problems: partial order relation
- ZW-PARTIAL-ORDER-RELATION-001 Which of these relations on ℤ is a partial order?
- ZW-PARTIAL-ORDER-RELATION-002 Which partial-order property fails for R=\(1,1),(2,2),(1,2),(2,1)\ on \1,2\?
- ZW-PARTIAL-ORDER-RELATION-003 In \1,2,3,4,6,12\ under divisibility, which pair of elements is incomparable?
- ZW-PARTIAL-ORDER-RELATION-004 If preceq is a partial order with apreceq b and bpreceq a, what follows?
- ZW-PARTIAL-ORDER-RELATION-005 Why is < on ℤ not a partial order?
- ZW-PARTIAL-ORDER-RELATION-006 How many pairs (a,b) with a,b∈\1,dots,6\ satisfy a| b?
- ZW-PARTIAL-ORDER-RELATION-008 R=\(1,1),(2,2),(3,3),(1,2),(2,3)\ on \1,2,3\ is not a partial order. Which pair suffices to add to…
- ZW-PARTIAL-ORDER-RELATION-009 How many different partial orders are there on the set \1,2\?
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