The problem likely stems from the tag. Moreover, it does not seem to work well with hyperref, as a reference with \hyperref[fail:test_tag]{my text} online(!) seems to display the text associated with the label instead of the text in the \hyperref: see this description.
Conclusion: avoid \tag (or investigate and modify this text accordingly!).
With tabular (and center):
x | 1 |
y | 2 |
z | 1 |
With tabular and @{} (and center):
x | 1. |
y | 2. |
z | 1. |
With tabular and p{} (and center):
x | 1 | 2 |
y | 2 | 3 |
z | 1 | 4 |
With array:
With array:
The | domain | of a function is the set of all admissible inputs of the function. |
The | image | of a function is the set of all actual outputs of the function. |