Show that if f is continuous on [0,1] with f(0)=f(1), there must exist x,y in [0,1] with |x−y|=1/2 and f(x)=f(y) I've been working on this for a while, and can't seem to figure out where to start. Any hints would be appreciated

aurelegena

aurelegena

Answered question

2022-09-06

Show that if f is continuous on [0,1] with f ( 0 ) = f ( 1 ), there must exist x , y [ 0 , 1 ] with | x y | = 1 2 and f ( x ) = f ( y )
I've been working on this for a while, and can't seem to figure out where to start. Any hints would be appreciated

Answer & Explanation

farbhas3t

farbhas3t

Beginner2022-09-07Added 6 answers

Let g be the function defined at [ 0 , 1 2 ] by
g : t f ( t ) f ( t + 1 2 )
we have
gg is continuous at [ 0 , 1 2 ]
and
g ( 0 ) . g ( 1 2 ) = ( f ( 0 ) f ( 1 2 ) ) 2 0 since f ( 0 ) = f ( 1 ).
then
x [ 0 , 1 2 ] such that g ( x ) = 0 or
f ( x ) = f ( x + 1 2 ) = f ( y )
with y = x + 1 2 satisfying
| y x | = 1 2

Do you have a similar question?

Recalculate according to your conditions!

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?