##  [Descartes' Rule of Signs](/descartes-rule-signs) 

  ##  [Descartes' Rule of Signs](https://algebra.quantumdictionary.io/descartes-rule-signs-0) 

  

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- Pure Mathematics -

**Algebra Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A technique that gives an upper bound and parity constraint for the number of positive real roots of a real-coefficient polynomial by counting the number of sign changes in the ordered sequence of its nonzero coefficients when the polynomial is written with descending powers.