If two complementary Plücker characteristics are equal, then each characteristic is equal to its complement except in four cases where the sum of order and class is 9.

# Bioche's Theorem

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## References

Coolidge, J. L.*A Treatise on Algebraic Plane Curves.*New York: Dover, p. 101, 1959.

## Referenced on Wolfram|Alpha

Bioche's Theorem## Cite this as:

Weisstein, Eric W. "Bioche's Theorem."
From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/BiochesTheorem.html