Imaginary number

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A topic known well beyond its field, found in many languages.

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Notion

Domain

Science and technology

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What Wikipedia says

An imaginary number is the product of a real number and the imaginary unit i, which is defined by its property i2 = −1. The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary.

Excerpt from the Wikipedia article “Imaginary number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mathamort, Public domain, via Wikimedia Commons.