Proving AM GM Inequality & Solving for Integers | Homework Help

In summary, the conversation discusses how to prove two statements using the AM GM inequality. The first statement is 5 < 51/2 + 51/3 + 51/4 and the second statement is n > n1/2 + n1/3 + n1/4 for all integers n>8. The conversation also mentions using the expression 51/2 + 51/3 + 51/4 > 3(513/36) and how to show that it is greater than 5. Ultimately, the conversation concludes with the statement that the second part can also be proven using the same method.
  • #1
The legend
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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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  • #2


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??
 
  • #3


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:
 

1. What is the AM-GM inequality?

The AM-GM inequality, also known as the Arithmetic Mean-Geometric Mean inequality, is a fundamental inequality in mathematics that states that the arithmetic mean of a set of non-negative numbers is greater than or equal to the geometric mean of the same set of numbers.

2. Why is the AM-GM inequality important?

The AM-GM inequality is important because it has many applications in various branches of mathematics, such as algebra, geometry, and calculus. It is also a useful tool for solving optimization problems and proving other mathematical theorems.

3. How is the AM-GM inequality used in mathematics?

The AM-GM inequality is commonly used to prove other inequalities and theorems. It is also used in various optimization problems, such as finding the minimum or maximum value of a function. Additionally, it has applications in statistics and physics.

4. Can you provide an example of the AM-GM inequality?

Sure, for example, if we have the numbers 2, 4, and 6, the arithmetic mean is (2+4+6)/3 = 4 and the geometric mean is ∛(2*4*6) = ∛48 ≈ 3.63. Since 4 ≥ 3.63, the AM-GM inequality holds true for this set of numbers.

5. Are there any generalizations of the AM-GM inequality?

Yes, there are several generalizations of the AM-GM inequality, such as the weighted AM-GM inequality, which takes into account different weights for each number in the set, and the Power Mean inequality, which includes a parameter to control the degree of the means used.

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