Implicit Function/Examples/x^2 + y^2 + 1 = 0
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Examples of Implicit Functions
Consider the equation:
- $(1): \quad x^2 + y^2 + 1 = 0$
where $x, y \in \R$ are real variables.
Solving for $y$, we obtain:
- $y = \pm \sqrt {-1 - x^2}$
and it is seen that no $y \in \R$ can satisfy this equation.
Hence $(1)$ does not define a real function.
Sources
- 1963: Morris Tenenbaum and Harry Pollard: Ordinary Differential Equations ... (previous) ... (next): Chapter $1$: Basic Concepts: Lesson $2 \text D$: Implicit Function