If a fixed point is added to each group of a special complete series, then the resulting series is complete.
Reduction Theorem
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References
Coolidge, J. L. A Treatise on Algebraic Plane Curves. New York: Dover, p. 253, 1959.Referenced on Wolfram|Alpha
Reduction TheoremCite this as:
Weisstein, Eric W. "Reduction Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ReductionTheorem.html