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 Floor and Absolute (Posted on 2012-08-17)
Evaluate the following:
(i) Limit floor(abs(n))/abs(floor(n))
abs(n)→ ∞

503
(ii) abs(floor(x)) dx
-2012

 No Solution Yet Submitted by K Sengupta No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
 Solution? | Comment 1 of 2
This seems a bit easy but here's that I got.

(i) 1
The function
floor(abs(n))/abs(floor(n))

evaluates to 1 for all integers and for all positive real numbers.  For negative non-integers where abs(n) is between consecutive whole numbers a and a+1 the function evaluates to a/(a+1) which  also goes to 1.

(ii) 2151331

The negative part is just the sum of the numbers 1 to 2012 and the positive part is just the sum of the numbers 0 to 502.

2012*2013/2 + 502*503/2 = 2151331

The integral of the first function would have been a bit harder...

 Posted by Jer on 2012-08-17 14:08:37

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