Definition:Square Root/Negative
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Definition
Let $x \in \R_{> 0}$ be a (strictly) positive real number.
The negative square root of $x$ is the number defined and denoted as:
- $-\sqrt x := y \in \R_{<0}: y^2 = x$
Also see
Sources
- 1977: K.G. Binmore: Mathematical Analysis: A Straightforward Approach ... (previous) ... (next): $\S 1$: Real Numbers: $\S 1.10$: Quadratic equations