With the development of higher math (polynomial rings) the concept behind an imaginary number became more substantial but then one also finds other imaginary numbers such as the j of tessarines which has a square of +1. The tessarines are a mathematical idea introduced by James Cockle in 1848. The concept includes both ordinary complex numbers and split-complex numbers.

So if you think i is alone in the imaginary universe, don't forget the forgotten number j.

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