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# Two multiple choice questions?

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825
9

The greatest integer, function, represented by $$f(x)=[[x]]$$ is continuous:

a. everywhere, all real numbers

b. on its domain

c. only where x is an integer

d. none of these

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Determine the value of $$\lim_{x\rightarrow1} [ [x] ]$$

a. 0

b. DNE

C. 1

D. None of these

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I'm going to try and look inside my textbook as well.

Sep 20, 2014

#7
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Ok.  It's the largest integer less than or equal to x, whereas I assumed it was the smallest integer greater than or equal to x.  The graph will look pretty much the same though, except it will be shifted along the x-axis by one unit!

And your limit calculations are correct chilledz3non.

Sep 21, 2014

#1
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The graph of the function below might help Sep 20, 2014
#2
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I'm sorry I have not seen questions like these before.

I do not know the notation [[x]]       It is a mystery to me?

Sep 20, 2014
#3
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I've taken this notation to mean the nearest integer that is greater than or equal to x.

e.g. if x = 2.1 then [[x]] = 3

if x = 1 then [[x]] = 1

if x = -1.5 then [[x]] = -1

Sep 20, 2014
#4
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Have you seen notation like this before or is it just an educated guess?

Sep 20, 2014
#5
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So judging from your graph Allen, I'm going to say that $$f(x)=[[x]]$$ is not continuous anywhere, since you have to lift your pencil to draw the graph. Am I right or wrong?

Sep 20, 2014
#6
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I finally found it in my textbook, but there is only one example. -------------------------------------------

I also did some work to prove that the limit does not exist, but I'm not sure if it is correct. Sep 20, 2014
#7
+10

Ok.  It's the largest integer less than or equal to x, whereas I assumed it was the smallest integer greater than or equal to x.  The graph will look pretty much the same though, except it will be shifted along the x-axis by one unit!

And your limit calculations are correct chilledz3non.

Alan Sep 21, 2014
#8
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So it is a "Floor" function I think.

I think the answer is "none of these"

The function is continuous for every x that is NOT an integer.  That's what I think anyway.

Sep 21, 2014
#9
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Since I solved the limit and it gave me two different answers for the left side and right side I chose "DNE". Could that be correct as well?

Sep 21, 2014