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Define a relation R on Zopf by aRb iff 2 divides a + b. Find all equivalence classes w.r.t. R.
Solution
R: a congruent to -b ( mod 2 ) is an equivalence relation.
We can easily see that it is reflexive,symmetric and transitive.
a congruent to -b ( mod 2 ) iff either both a and b are odd or both a and b are even.
The equivalence classes of R are
[0]: all even integers
[1]: all odd integers

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