12.3. Consider the formula ³x‡yªz(P(x, y) ^ P(z, y) ^ P(x, z) ^ ¬P(z, x)). Under each of these interpretations, is this formula true? In each case, R is the relation corresponding to P. (a) U =N, R= {(x, y) : x < y}. (b) U=N, R= {(x,x+ 1) :x ≥0}. (c) U= the set of all bit strings, R = {(x, y) : x is lexicographically earlier than y}. (d) U = the set of all bit strings, R= {(x, y): y=x0 or y=x1}. (e) U=P(N), R = {(A, B) : A ≤ B}.
12.3. Consider the formula ³x‡yªz(P(x, y) ^ P(z, y) ^ P(x, z) ^ ¬P(z, x)). Under each of these interpretations, is this formula true? In each case, R is the relation corresponding to P. (a) U =N, R= {(x, y) : x < y}. (b) U=N, R= {(x,x+ 1) :x ≥0}. (c) U= the set of all bit strings, R = {(x, y) : x is lexicographically earlier than y}. (d) U = the set of all bit strings, R= {(x, y): y=x0 or y=x1}. (e) U=P(N), R = {(A, B) : A ≤ B}.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.2: Exponents And Radicals
Problem 87E
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