=t₁S = {3 +; = {3+1 ²+/2 = ne ¡:neN}. Prove that sup (S) = 4.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Question
Let S = =
{3+ 42:n € N}. Prove that
sup (S) = 4.
Prove that 3 = 4 is an upper bound of S
E
Show that, for € > 0, B - € (= 4 - €) is not an upper bound of S, i.e., show that there is
ES, such that, 4-e < x
Transcribed Image Text:Let S = = {3+ 42:n € N}. Prove that sup (S) = 4. Prove that 3 = 4 is an upper bound of S E Show that, for € > 0, B - € (= 4 - €) is not an upper bound of S, i.e., show that there is ES, such that, 4-e < x
Expert Solution
Step 1: giving conception

An element M is called an upper bound of a set S if there exists a number M such that x less or equal than M for all.x element of S.

For any set, supremum is the least upper bound.

Density property of R : For any two,x comma y element of R there exists a rational number r such that.x less than r less than y .

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