A root having multiplicity 
is called a simple root. For example,
has a simple root at
, but 
has a root of multiplicity
2 at 
, which is therefore not a simple
root.
Simple Root
See also
Multiple Root, Multiplicity, RootExplore with Wolfram|Alpha
References
Krantz, S. G. "Zero of Order n." §5.1.3 in Handbook of Complex Variables. Boston, MA: Birkhäuser, p. 70, 1999.Referenced on Wolfram|Alpha
Simple RootCite this as:
Weisstein, Eric W. "Simple Root." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SimpleRoot.html