In mathematics, omega function refers to a function using the Greek letter omega, written ω or Ω.
\Omega (big omega) may refer to:
- The lower bound in Big O notation,
f \in \Omega (g)\,\!, meaning that the functionf\,\!dominatesg\,\!in some limit - The prime omega function
\Omega(n)\,\!, giving the total number of prime factors ofn\,\!, counting them with their multiplicity. - The Lambert W function
\Omega(x)\,\!, the inverse ofy = x\cdot e^{x} \,\!, also denotedW(x)\,\!. - Absolute infinity
\omega (omega) may refer to:
- The Wright omega function
\omega(x)\,\!, related to the Lambert W Function - The Pearson–Cunningham function
\omega_{m,n}(x) - The prime omega function
\omega(n)\,\!, giving the number of distinct prime factors ofn\,\!.