The infimum of all number  for which
holds for all 
 and 
 an entire function, is called the order of 
, denoted 
 (Krantz 1999, p. 121).
The infimum of all number  for which
holds for all 
 and 
 an entire function, is called the order of 
, denoted 
 (Krantz 1999, p. 121).
Weisstein, Eric W. "Function Order." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/FunctionOrder.html