In mathematics, Descartes' rule of signs, first described by René Descartes in his work La Géométrie, is a technique for determining the number of positive or negative real roots of a polynomial.
The rule gives us an upper bound number of positive or negative roots of a polynomial. It is not a complete criterion, i.e. it does not tell the exact number of positive or negative roots.
Read more about Descartes' Rule Of Signs: Special Case, Generalizations
Famous quotes containing the words rule and/or signs:
“While Michael Angelo’s Sistine roof,
His “Morning” and his “Night” disclose
How sinew that has been pulled tight,
Or it may be loosened in repose,
Can rule by supernatural right
Yet be but sinew.”
—William Butler Yeats (1865–1939)
“Surrealism is a bourgeois disaffection; that its militants thought it universal is only one of the signs that it is typically bourgeois.”
—Susan Sontag (b. 1933)