# tables

#### dwsmith

##### Well-known member
I am trying to make this into jordan canonical form.

How can I box in the bottom two lambdas?

$$\left[\begin{array}{ccc} \begin{array}{cccc|} \lambda & 1 & 0 & \\ & \lambda & 1 & 0\\ & & \lambda & 1\\ & & & \lambda\\\hline \end{array} & & \\ & \begin{array}{c|} \lambda\\\hline \end{array} & \\ & & \begin{array}{c|} \lambda\\\hline \end{array} \end{array}\right]$$

On my pdf, it doesn't do this.

#### Ackbach

##### Indicium Physicus
Staff member
Why not just do this sort of thing:

$$\left[\begin{array}{cc}\boxed{\lambda} & \\ &\boxed{\lambda}\end{array}\right]$$

Anything you want can be in a boxed environment, including another array environment. Also note that entries in the array environment can be empty. With that combination of information, I think you can do what you want with boxing.