Our February Insights puzzle sent readers on a treasure hunt based on complex numbers. First we provided a bit of a primer, demonstrating that complex numbers (expressions of the form a + bi, where ...

Some essential square roots are better memorised When tackling square roots of complex numbers in an exam, knowing some key square roots in advance can save both time and effort.

In spite of their name, “imaginary” numbers are as real as any other numbers, especially when it comes to hunting for lost treasure.