Prove the following inequality

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Homework Help Overview

The discussion revolves around proving an inequality involving real numbers \(a\), \(b\), and \(c\) that are non-zero, as well as natural numbers \(u\) and \(\lambda\). The specific inequality to be proven compares a ratio of sums of powers of \(a\), \(b\), and \(c\) to a function of \(u\) and \(\lambda\).

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster suggests using induction but expresses concern that it may complicate the proof. Participants discuss the idea of manipulating the left-hand side by subtracting a constant, leading to questions about the implications of such a subtraction on the inequality.

Discussion Status

Participants are actively engaging with the problem, exploring different approaches to manipulate the inequality. There is a mix of suggestions and clarifications, with no clear consensus on the best method to proceed. The discussion remains open-ended with various interpretations being explored.

Contextual Notes

Participants are navigating the constraints of the problem, particularly regarding the manipulation of the inequality and the implications of subtracting constants. The nature of the variables involved and their restrictions are also under consideration.

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Homework Statement



prove the following inequality:

Homework Equations



[tex]\frac{a^4+b^4+c^4}{a^2b^2+a^2c^2+b^2c^2}\geq\frac{2u+3\lambda}{3(u+\lambda)}[/tex]

for all the reals a,b,c different from zero and for all the natural u,λ

The Attempt at a Solution



induction i think in this case will make things worst
 
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hi evagelos! :smile:

(try using the X2 tag just above the Reply box :wink:)

hint: subtract a constant from the lhs :wink:
 


Sorry tiny-tim i don't get what you mean .What constant must i subtract from the l.h.s.
 
that's for you to find out! :wink:
 


you cannot subtract a constant, only, from the left hand side because then you change the inequality
 
ok, then subtract it from both sides :smile:
 

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