Proving AM GM Inequality & Solving for Integers | Homework Help

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SUMMARY

The discussion focuses on proving the AM-GM inequality for specific integer cases. The user successfully demonstrated that \(5 < 5^{1/2} + 5^{1/3} + 5^{1/4}\) using the AM-GM inequality, concluding that \(5^{1/2} + 5^{1/3} + 5^{1/4} > 5\). Additionally, the user proved that \(n > n^{1/2} + n^{1/3} + n^{1/4}\) holds true for all integers \(n > 8\). The discussion emphasizes the application of the AM-GM inequality in these proofs.

PREREQUISITES
  • Understanding of the AM-GM inequality
  • Basic knowledge of exponentiation and roots
  • Familiarity with integer properties
  • Ability to manipulate algebraic expressions
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  • Study the proof techniques for the AM-GM inequality
  • Explore applications of inequalities in number theory
  • Learn about advanced inequality proofs involving integers
  • Investigate other inequalities such as Cauchy-Schwarz and Jensen's inequality
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This discussion is beneficial for students studying algebra, particularly those tackling inequalities, as well as educators and tutors looking for examples of AM-GM applications in integer proofs.

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Homework Statement



Prove

a)5 < 51/2 + 51/3 + 51/4

b) n > n1/2 + n1/3 + n1/4 for all ints n>8

Homework Equations





The Attempt at a Solution


i tried the AM GM inequality
and found

51/2 + 51/3 + 51/4 > 3(513/36)

what further can i do?
can anyone please help me out??
 
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The legend said:

Homework Statement



Prove

a)5 < 51/2 + 51/3 + 51/4

b) n > n1/2 + n1/3 + n1/4 for all ints n>8

Homework Equations





The Attempt at a Solution


i tried the AM GM inequality
and found

51/2 + 51/3 + 51/4 > 3(513/36)
> 3 * 51/3 = (27 * 5)1/3

Can you show that the last expression is > 5?
The legend said:
what further can i do?
can anyone please help me out??
 


Thanks
so i got that part and showed the expression > 5.

I could prove the 2nd part by this method too!

Thanks a lot! :smile:
 

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