Definition 1. If A and B are sets, then their symmetric difference is defined to be AAB (AB) U (BA) i.e. AB is the set of elements which lie in exactly one of the sets A or B. Exercise 2. Let be the relation on P(N) defined by AB AB and min(AAB) = A. (i) Prove that is a linear ordering of P(N). (ii) Prove that is not a well-ordering of P(N). Exercise 3. Prove that if m, n Ew satisfy m < n, then there exists pЄ w such that nm+p+. (Hint: Argue by induction on n.)
Definition 1. If A and B are sets, then their symmetric difference is defined to be AAB (AB) U (BA) i.e. AB is the set of elements which lie in exactly one of the sets A or B. Exercise 2. Let be the relation on P(N) defined by AB AB and min(AAB) = A. (i) Prove that is a linear ordering of P(N). (ii) Prove that is not a well-ordering of P(N). Exercise 3. Prove that if m, n Ew satisfy m < n, then there exists pЄ w such that nm+p+. (Hint: Argue by induction on n.)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Definition 1. If A and B are sets, then their symmetric difference is defined to be
AAB (AB) U (BA)
i.e. AB is the set of elements which lie in exactly one of the sets A or B.
Exercise 2. Let be the relation on P(N) defined by
AB
AB and min(AAB) = A.
(i) Prove that
is a linear ordering of P(N).
(ii) Prove that
is not a well-ordering of P(N).
Exercise 3. Prove that if m, n Ew satisfy m < n, then there exists pЄ w such
that nm+p+.
(Hint: Argue by induction on n.)
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