Editing Quater-imaginary base (section)

===Example: Subtraction===
Subtraction is analogous to addition in that it uses the same two rules described above. Below is an example:

<pre>
         − 2 − 8i                       1102
           1 − 6i                       1011
           -------           <=>        -----
         − 3 − 2i                       1131
</pre>

In this example we have to subtract <math>1011_{2i}</math> from <math>1102_{2i}</math>. The rightmost digit is 2−1 = 1. The second digit from the right would become −1, so add 4 to give 3 and then carry +1 two places to the left. The third digit from the right is 1−0 = 1. Then the leftmost digit is 1−1 plus 1 from the carry, giving 1. This gives a final answer of <math>1131_{2i}</math>.