Difference between revisions of "1998 IMO Problems/Problem 6"

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==Problem==
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Determine the least possible value of <math>f(1998),</math> where <math>f:\Bbb{N}\to \Bbb{N}</math> is a function such that for all <math>m,n\in {\Bbb N}</math>,  
 
Determine the least possible value of <math>f(1998),</math> where <math>f:\Bbb{N}\to \Bbb{N}</math> is a function such that for all <math>m,n\in {\Bbb N}</math>,  
  
 
<cmath>f\left( n^{2}f(m)\right) =m\left( f(n)\right) ^{2}. </cmath>
 
<cmath>f\left( n^{2}f(m)\right) =m\left( f(n)\right) ^{2}. </cmath>
  
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==Solution==
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{{solution}}
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==See Also==
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{{IMO box|year=1998|num-b=5|after=Last Question}}
 
[[Category:Olympiad Algebra Problems]]
 
[[Category:Olympiad Algebra Problems]]
 
[[Category:Functional Equation Problems]]
 
[[Category:Functional Equation Problems]]

Revision as of 22:54, 18 November 2023

Problem

Determine the least possible value of $f(1998),$ where $f:\Bbb{N}\to \Bbb{N}$ is a function such that for all $m,n\in {\Bbb N}$,

\[f\left( n^{2}f(m)\right) =m\left( f(n)\right) ^{2}.\]

Solution

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See Also

1998 IMO (Problems) • Resources
Preceded by
Problem 5
1 2 3 4 5 6 Followed by
Last Question
All IMO Problems and Solutions