Chapter 11: Problem 8
Let \(A=\\{1,2,3,4,5,6\\} .\) Observe that \(\varnothing \subseteq A \times A,\) so \(R=\varnothing\) is a relation on \(A .\) Draw a diagram for this relation.
Chapter 11: Problem 8
Let \(A=\\{1,2,3,4,5,6\\} .\) Observe that \(\varnothing \subseteq A \times A,\) so \(R=\varnothing\) is a relation on \(A .\) Draw a diagram for this relation.
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Get started for freeDo the following calculations in \(\mathbb{Z}_{9}\), in each case expressing your answer as \([a]\) with \(0 \leq a \leq 8\) (a) \([8]+[8]\) (b) \([24]+[11]\) (c) [21]\(\cdot[15]\) (d) [8]\(\cdot[8]\)
List all the partitions of the set \(A=\\{a, b, c\\}\). Compare your answer to the answer to Exercise 6 of Section 11.3 .
Suppose \(R\) is a symmetric and transitive relation on a set \(A,\) and there is an element \(a \in A\) for which \(a R x\) for every \(x \in A .\) Prove that \(R\) is reflexive.
Suppose \(R\) is a reflexive and symmetric relation on a finite set \(A .\) Define a relation \(S\) on \(A\) by declaring \(x S y\) if and only if for some \(n \in \mathbb{N}\) there are elements \(x_{1}, x_{2}, \ldots, x_{n} \in A\) satisfying \(x R x_{1}, x_{1} R x_{2}, x_{2} R x_{3}, x_{3} R x_{4}, \ldots, x_{n-1} R x_{n},\) and \(x_{n} R y .\) Show that \(S\) is an equivalence relation and \(R \subseteq S .\) Prove that \(S\) is the unique smallest equivalence relation on \(A\) containing \(R\).
Let \(A=\\{1,2,3,4,5,6\\} .\) How many different relations are there on the set \(A\) ?
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