The Gaussian-School of Higher-Arithmetic (1831, updated 2022); tutorial #21 page 12b.

The Arithmetic of Clocks, page 12b.

Before any natural philosopher could consider his own situation he must first form a logical understanding of his own position of observation within relative time. After we have pondered the exponential numerical domain of Universal Historic Space formation, we need to find out where the neo-Pythagorean flat-earth-philosophers went wrong. The neo-Pythagoreans have declared i to be a number, the square root of minus-one. However, as we can see from the complex exponential number plane diagram, i is the rotational operator and so i is not a number.