1 2. (a) Prove that V n E N, 2n V

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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1
2. (a) Prove that V n e N,
2n
n
1 and an+1
an + 2. Prove that an is convergent and find
(b) Let a1
limn+o an.
H00
Transcribed Image Text:1 2. (a) Prove that V n e N, 2n n 1 and an+1 an + 2. Prove that an is convergent and find (b) Let a1 limn+o an. H00
(b) Show that Vx E R, x2 – 4x + 5 > 0.
x² + 1
(c) Prove that if A =
r2
x E R} then A is a bounded subset of R.
2.x + 3
-
4. (a) Let Q = : a, b e Z, b 0, ged(a,b) = 1} be the set of rational numbers.
An integer p is called a prime number if p has only two factors; 1 and p itself.
Prove that p is not a rational number. Hence or otherwise verify the
irrationality of V3.
(b) Consider the statement: if x <y +e, Ve > 0, then x < y. State the
hypothesis P(, y) and the conclusion Q(x, y) of the statement and prove by
contraposition that the implication P(x, y) → Q(x, y) is true.
1
5. (a) Consider the sequence
2' 5
general term, an of the sequence.
-2 3 -4
Give a rule for obtaining the
8' 11
(b) A sequence an is said to converge to a real number a* provided for each
€ > 0, 3 n(e) E N, such that V n E N, n > n(e) , implies |an - a*| < € . Let
n
An
be
a sequence defined by an =
V n > 1. Show that limn- An = 1
n +1'
and prove your assertion.
(c) Let an be a convergent sequence in R . Prove that an is bounded.
Transcribed Image Text:(b) Show that Vx E R, x2 – 4x + 5 > 0. x² + 1 (c) Prove that if A = r2 x E R} then A is a bounded subset of R. 2.x + 3 - 4. (a) Let Q = : a, b e Z, b 0, ged(a,b) = 1} be the set of rational numbers. An integer p is called a prime number if p has only two factors; 1 and p itself. Prove that p is not a rational number. Hence or otherwise verify the irrationality of V3. (b) Consider the statement: if x <y +e, Ve > 0, then x < y. State the hypothesis P(, y) and the conclusion Q(x, y) of the statement and prove by contraposition that the implication P(x, y) → Q(x, y) is true. 1 5. (a) Consider the sequence 2' 5 general term, an of the sequence. -2 3 -4 Give a rule for obtaining the 8' 11 (b) A sequence an is said to converge to a real number a* provided for each € > 0, 3 n(e) E N, such that V n E N, n > n(e) , implies |an - a*| < € . Let n An be a sequence defined by an = V n > 1. Show that limn- An = 1 n +1' and prove your assertion. (c) Let an be a convergent sequence in R . Prove that an is bounded.
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