e "equivalence class" of a. Show that for a, b E A, a Rbif and only if (a) C (b). What can be concluded about a, b E A if (a) = (b)? Explain.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Let A be a nonempty set with partial order R. For each a E A, let (a) = {x E A| x Ra}. Note: If R was an equivalence relation, then we can think of (a) as
the "equivalence class" of a.
1. Show that for a, b e A, a Rb if and only if (a) C (b).
2. What can be concluded about a, b e A if (a) = (b)? Explain.
3. Let BC Awith B nonempty, and suppose c E A is an upper bound of B. Is (c) an upper bound of F = {(b) | be B}? Note that for this question, the
poset we are now using is P(A) with C.
Transcribed Image Text:Let A be a nonempty set with partial order R. For each a E A, let (a) = {x E A| x Ra}. Note: If R was an equivalence relation, then we can think of (a) as the "equivalence class" of a. 1. Show that for a, b e A, a Rb if and only if (a) C (b). 2. What can be concluded about a, b e A if (a) = (b)? Explain. 3. Let BC Awith B nonempty, and suppose c E A is an upper bound of B. Is (c) an upper bound of F = {(b) | be B}? Note that for this question, the poset we are now using is P(A) with C.
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