Definition:Subtraction/Real Numbers
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Definition
Let $\struct {\R, +, \times}$ be the field of real numbers.
The operation of subtraction is defined on $\R$ as:
- $\forall a, b \in \R: a - b := a + \paren {-b}$
where $-b$ is the negative of $b$ in $\R$.
Sources
- 1971: Wilfred Kaplan and Donald J. Lewis: Calculus and Linear Algebra ... (previous) ... (next): Introduction: Review of Algebra, Geometry, and Trigonometry: $\text{0-1}$: The Real Numbers