Discrete Math Function - Unsure about Symbol

Question

Working through a chapter about functions, and I'm a bit unsure how to read the below:

For example, for the f(1), is this outputting the absolute value of (1+1/3)?

Answer 1

The function $\lceil \cdot \rceil$ is the ceiling function or the least integer function. This function takes a real number $x$ as an input, then gives the least integer greater than or equal to $x$ as output. For example:

$$ \lceil 1 \rceil = 1, \qquad \lceil \pi \rceil = 4, \qquad \lceil -\tfrac{3}{2} \rceil = -1, \qquad\text{and}\qquad \lceil 1.00000000001\rceil = 2.$$