Proof or counterexaample of Floor 7 Ceiling

  • #1

Homework Statement



For all real numbers x and y, ceiling of x,y = ceiling of x times ceiling of y
For all odd integers n, ceiling of n/2 = (n+1)/2

Homework Equations



definition floor: floor of x = n n<or equal to x < n+1
definition ceiling: ceiling of x=n n-1 < x <orequal to n.

The Attempt at a Solution



No idea where to even start. I don'r quite understand the concept and floor & ceiling.
 

Answers and Replies

  • #2
34,896
6,638

Homework Statement



For all real numbers x and y, ceiling of x,y = ceiling of x times ceiling of y
I don't understand what you are asking in the problem above. What does "ceiling of x, y" mean?
For all odd integers n, ceiling of n/2 = (n+1)/2
This one is straightforward. If n is odd, then n/2 will have a fractional part that is 1/2 or .5.

Homework Equations



definition floor: floor of x = n n<or equal to x < n+1
definition ceiling: ceiling of x=n n-1 < x <orequal to n.
Your definitions are not precise enough to be helpful. floor(x) is the largest integer that is less than or equal to x. For example, floor(2) = 2, and floor (1.99) = 1

ceiling(x) is the smallest integer that is greater than or equal to x. For example, ceiling(5) = 5, and ceiling(1.01) = 2.

The Attempt at a Solution



No idea where to even start. I don'r quite understand the concept and floor & ceiling.
 
  • #3
statdad
Homework Helper
1,495
35
Is your first question whether the following statement is true or false?

[tex]
\text{ceiling}(x \times y) = \text{ceiling}(x) \times \text{ceiling}(y)
[/tex]

If so - try a few test values for [itex] x [/itex] and [itex] y [/itex].
 

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