(e) 3x E R, Vy E R, xy > 0. (f) Vx E R, 3y E R, xy > 0. (g) 3x E R, Vy E R, xy > 0.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.2: Statements And Reasoning
Problem 56E: In Exercises 55 and 56, P is a true statement, while Q and R are false statements. Classify each of...
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6. Determine whether each of the following statements is true or false. If the statement is
true, then prove it. If the statement is false, write down the negation of the statement
and prove that.
(a) Vx E R, 3y E R, x + y > 0.
(b) Vx E R, 3y E R, x – y > 0.
(c) 3x E R, Vy E R, x + y > 0.
(d) Vx E R, 3y E R, xy > 0.
(e) 3x ER, Vy E R, xy > 0.
(f) Vx E R, 3y E R, xy > 0.
(g) 3x E R, Vy E R, xy > 0.
(h) Vx E R, 3y E R, (x + y > 0 or x + y = 0).
(i) Vx E R, 3y E R, (x + y > 0 and x +y = 0).
(j) (Vx E R, 3y E R, x + y > 0) and (Vx E R, 3y E R, x + y = 0).
Transcribed Image Text:6. Determine whether each of the following statements is true or false. If the statement is true, then prove it. If the statement is false, write down the negation of the statement and prove that. (a) Vx E R, 3y E R, x + y > 0. (b) Vx E R, 3y E R, x – y > 0. (c) 3x E R, Vy E R, x + y > 0. (d) Vx E R, 3y E R, xy > 0. (e) 3x ER, Vy E R, xy > 0. (f) Vx E R, 3y E R, xy > 0. (g) 3x E R, Vy E R, xy > 0. (h) Vx E R, 3y E R, (x + y > 0 or x + y = 0). (i) Vx E R, 3y E R, (x + y > 0 and x +y = 0). (j) (Vx E R, 3y E R, x + y > 0) and (Vx E R, 3y E R, x + y = 0).
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