Noun
Nevanlinna theory (uncountable)
(complex analysis) A part of the theory of meromorphic functions that describes the asymptotic distribution of solutions to the equation ƒ(z) = a, as a varies.
A key tool in Nevanlinna theory is the Nevanlinna characteristic,
T
(
r
,
f
)
{\displaystyle T(r,f)}
, which measures the rate of growth of a meromorphic function.
Nevanlinna's value distribution theory or Nevanlinna theory is crystallized in its two Main Theorems. Source: Internet