Let P ( m , n ) be the statement “ m divides n ," where the domain for both variables consists of all positive integers. (By " m divides n " we mean that n = km for some integer k .) Determine the truth values of each of these statements. a) P ( 4 , 5 ) b) P ( 2 , 4 ) c) ∀ m ∀ n P ( m , n ) d) ∃ m ∀ n P ( m , n ) e) ∃ n ∀ m P ( m , n ) f) ∀ n P ( 1 , n )
Let P ( m , n ) be the statement “ m divides n ," where the domain for both variables consists of all positive integers. (By " m divides n " we mean that n = km for some integer k .) Determine the truth values of each of these statements. a) P ( 4 , 5 ) b) P ( 2 , 4 ) c) ∀ m ∀ n P ( m , n ) d) ∃ m ∀ n P ( m , n ) e) ∃ n ∀ m P ( m , n ) f) ∀ n P ( 1 , n )
Solution Summary: The author explains the truth value of the statement P (4, 5) which means ‘4 divide 5’ is false.
LetP(m,n) be the statement “mdividesn," where the domain for both variables consists of all positive integers. (By "mdividesn" we mean that
n
=
km
for some integerk.) Determine the truth values of each of these statements.
A function is defined on the interval (-π/2,π/2) by this multipart rule:
if -π/2 < x < 0
f(x) =
a
if x=0
31-tan x
+31-cot x
if 0 < x < π/2
Here, a and b are constants. Find a and b so that the function f(x) is continuous at x=0.
a=
b= 3
Use the definition of continuity and the properties of limits to show that the function is continuous at the given number a.
f(x) = (x + 4x4) 5,
a = -1
lim f(x)
X--1
=
lim
x+4x
X--1
lim
X-1
4
x+4x
5
))"
5
))
by the power law
by the sum law
lim (x) + lim
X--1
4
4x
X-1
-(0,00+(
Find f(-1).
f(-1)=243
lim (x) +
-1 +4
35
4 ([
)
lim (x4)
5
x-1
Thus, by the definition of continuity, f is continuous at a = -1.
by the multiple constant law
by the direct substitution property
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Grade 12 and UG/ Introduction to logical statements and truth tables; Author: Dr Trefor Bazett;https://www.youtube.com/watch?v=q2eyZZK-OIk;License: Standard YouTube License, CC-BY