Problem 9. In each case determine if the given relation R on A is an equivalence relation. Justify your answer. (a) A = Z and aRb if ab > 0. (b) A = Z and aRb if 5|a – b. (c) A = Z and aRb if 5 a? - 6². -

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Chapter2: Second-order Linear Odes
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This explains why we usually consider congruence modulo m >1 only.
Problem 9. In each case determine if the given relation R on A is an equivalence relation.
Justify your answer.
(a) A = Z and a Rb if ab > 0.
(b) A = Z and aRb if 5|a – b.
(c) A = Z and aRb if 5 a2 – b².
(d) A = Z and a Rb if 5|a3 – 63.
(e) A = Z and aRb if 5 a4 - b4.
(f) A = Z and aRb if 5 a -65.
(g) A = R? and (a, b)R(c, d) if a = c.
(h) A = R? and (a, b)R(c, d) if a² + b² = c² + d.
Problem 10. In each case determine if the given relation R on A is a partial order. Justify
If the answer is positive determine if the order is total: if a b E A then aBh or
vour answer
Transcribed Image Text:This explains why we usually consider congruence modulo m >1 only. Problem 9. In each case determine if the given relation R on A is an equivalence relation. Justify your answer. (a) A = Z and a Rb if ab > 0. (b) A = Z and aRb if 5|a – b. (c) A = Z and aRb if 5 a2 – b². (d) A = Z and a Rb if 5|a3 – 63. (e) A = Z and aRb if 5 a4 - b4. (f) A = Z and aRb if 5 a -65. (g) A = R? and (a, b)R(c, d) if a = c. (h) A = R? and (a, b)R(c, d) if a² + b² = c² + d. Problem 10. In each case determine if the given relation R on A is a partial order. Justify If the answer is positive determine if the order is total: if a b E A then aBh or vour answer
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