"""A functions module, includes all the standard functions.

Combinatorial - factorial, fibonacci, harmonic, bernoulli...
Elementary - hyperbolic, trigonometric, exponential, floor and ceiling, sqrt...
Special - gamma, zeta,spherical harmonics...
"""
from sympy.core.basic import Basic

import combinatorial
import elementary
import special

from special.polynomials import (legendre, assoc_legendre, hermite, chebyshevt,
        chebyshevu, chebyshevu_root, chebyshevt_root, laguerre_l)

# see #391
from combinatorial.factorials import factorial, factorial2, rf, ff, binomial
from combinatorial.factorials import factorial, RisingFactorial, FallingFactorial
from combinatorial.factorials import binomial, factorial2
from combinatorial.numbers import fibonacci, lucas, harmonic, bernoulli, bell

from elementary.miscellaneous import sqrt, Min, Max, Id
from elementary.complexes import re, im, sign, Abs, conjugate, arg
from elementary.trigonometric import acot, cot, tan, cos, sin, asin, acos, atan, atan2
from elementary.exponential import exp, log, LambertW
from elementary.hyperbolic import sinh, cosh, tanh, coth, asinh, acosh, atanh, acoth
from elementary.integers import floor, ceiling
from elementary.piecewise import Piecewise, piecewise_fold

from special.error_functions import erf
from special.gamma_functions import gamma, lowergamma, uppergamma, polygamma, \
         loggamma, digamma, trigamma
from special.zeta_functions import dirichlet_eta, zeta
from special.spherical_harmonics import Ylm, Zlm
from special.tensor_functions import Dij, Eijk
from special.delta_functions import DiracDelta, Heaviside
from special.bsplines import bspline_basis, bspline_basis_set
from special.bessel import jn, yn, jn_zeros

ln = log
