A good answer might be:
| Column Matrix |
 |
 |
 |
|---|---|---|---|
| Dimension | 3 | 4 | 4 |
| Column Matrix |
|
|
|
|---|---|---|---|
| Dimension | 3 | 4 | 4 |
The elements of a column matrix can be variables:
 |
 |
 |
The first element in a column matrix is sometimes given the index "0", and sometimes "1".
| Is the column matrix | |
the same as the column matrix |  | ? |