n-th power of x:
xn = pow(x,n)
Exponent of x (x-th power of e):
ex= exp(x)
Sine, cosine, tangent of x: sin(x), cos(x), tan(x)
Natural logarithm: ln x=log(x)
Gravitation constant: Grav_const
Planck constant with bar: Planck_bar
Speed of light: light_speed
π: pi
Mass of electron: electron_mass
Mass of proton: proton_mass
Charge of electron: elementary_charge
Boltzmann constant: Boltzmann_const
Fine structure constant: alpha_fine
Rydberg constant in ergs: Rydberg_erg
Stefan-Boltzmann constant: Stefan_Boltzmann_const
Thomson scatterng cross section: Thomson_cross_section
Bohr radius: Bohr_radius