Let S = {1,2,3,4} and let A = SxS
Define a relation R on A by (a,b)R(c,d) iff ad = bc
Write out each equivalence class (by "write out" I mean tell me
explicitly which elements of A are in each equivalence class)
Hint: |A| = 16 and there are 11 equivalence classes, so there
are several equivalence classes that consist of a single element of
A.
Let A = R x R, and let a relation S be defined as: “(x1, y1)
S (x2, y2) ⬄ points (x1, y1) and (x2, y2)are 5 units
apart.” Determine whether S is reflexive, symmetric, or transitive.
If the answer is “yes,” give a justification (full proof is not
needed); if the answer is “no” you must give a
counterexample.
1. Let R be the relation on A = {1, 2, 3, 4, 5} given by R =
{(1, 1),(1, 3),(2, 2),(2, 4),(2, 5),(3, 1),(3, 3),(4, 2),(4, 4),(4,
5),(5, 2),(5, 4),(5, 5)}.
(a) Draw the digraph which represents R.
(b) Give the 0 -1 matrix of R with respect to the natural
ordering.
(c) Which of the five properties (reflexive, irreflexive,
symmetric, antisymmetric, transitive) does R have? Give a brief
reason why or why not each property holds.
2. Let...
Let S = {2 k : k ∈ Z}. Let R be a relation defined on Q− {0} by
x R y if x y ∈ S. Prove that R is an equivalence relation.
Determine the equivalence class
1)Let S be the set of all students at a college. Define a
relation on the set S by the rule that two people are related if
they live less than 2 miles apart. Is this relation an equivalence
relation on S? Justify your answer.
2) Define another relation on the set S from problem 5 by
defining two people as related if they have the same classification
(freshman, sophomore, junior, senior or graduate student). Is this
an equivalence relation...
1)Let S be the set of all students at a college. Define a
relation on the set S by the rule that two people are related if
they live less than 2 miles apart. Is this relation an equivalence
relation on S? Justify your answer.
2) Define another relation on the set S from problem 5 by
defining two people as related if they have the same classification
(freshman, sophomore, junior, senior or graduate student). Is this
an equivalence relation...
Question 1. Equivalence Relation 1
Define a relation R on by iff .
Prove that R is an equivalence relation, that is, prove
that it is reflexive, symmetric, and transitive.
Determine the equivalence classes of this
relation.
What members are in the class [2]?
How many members do the equivalence classes have? Do
they all have the same number of members?
How many equivalence classes are there?
Question 2. Equivalence Relation 2
Consider the relation from last week defined
as:...