Definition. An algebraic equation in n variables is an polynomial equation of the form
where the coefficients are integers, the exponents ei are nonnegative integers and the sum is finite.
1. The octoide: x4 - (x2 + y2) = 0
2. The unit circle: x2 + y2 - 1 = 0
3. The unit sphere: x2 + y2 + z2 - 1 = 0
Source: Wolfram MathWord
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