0
$\begingroup$

I wonder if there is a mathematical notation for a polynomial defined by its roots. For example, a polynomial with $N$ roots $z_m$ ($m=1,...,N)$ can be written as $\prod\limits_{m=1}^N{(z-z_m)}$, but I am looking for something shorter like P$^N(z_m)$, indicating that it is a polynomial of order $N$ with the roots $z_m$ ($m=1,...,N)$.

$\endgroup$
3
  • $\begingroup$ I don't know any specific notation, but I'd say that $\prod (z-z_m)$ is already kind of simple. Also (I know you're not saying this would be a good notation), choosing the notation $P^N(z_m)$ would be hard to read: the square of its third derivative, evaluated at $z_m$ would be written $((P^N(z_m))^{(3)}(z_m))^2$ (it is a bit dramatic, sorry for that). $\endgroup$ Commented Jul 10 at 10:04
  • 1
    $\begingroup$ You are right, but the third derivative of $\prod\limits_{m=1}^N (z-z_m)$ would also get pretty long. Incidentally, I don't need any derivatives in my analysis, just products of polynomials. $\endgroup$
    – Mark
    Commented Jul 11 at 6:42
  • $\begingroup$ And you get to manipulate many of such polynomials? You could leave the exponent $N$ out, as it is clear that the degree of this polynomial is $N$. Also, you could write $P_{z_1,\dots,z_m}$ in order to be able to evaluate this polynomial without any confusion... $\endgroup$ Commented Jul 11 at 8:52

0

You must log in to answer this question.

Browse other questions tagged .