This GCSE activity gets pupils to use standard form (multiplying, dividing, converting from ordinary numbers) to find the mass and distance from th... (tes.com)
In other words, the coordinates in those peculiar spaces are not ordinary numbers, as they are for the space in which we live, but complex numbers, which are numbers that contain the square root of minus one. (firstthings.com)
Whereas ordinary numbers (and even complex numbers) have the common - sense property that a — b = b — a, Grassmann numbers have the bizarre property that a — b = - b — a. (firstthings.com)