List of symbols

$G$

Newton's Universal constant of Gravitation

M

Mach number (classical and relativistic)

$T$

Proper Temperature

$\mathprm{V}$

Proper volume per particle

$\ensuremath{\mathit{V}}$

Volume per unit mass

$a$

Relativistic sound speed

$c$

Newtonian (classical) sound speed

$\ensuremath{\mathsf{c}}$

Speed of light

$e$

Proper internal energy per unit proper volume

$\mathsf{k}$

Riemman curvature

$n$

Number of particles per unit proper volume

$p$

Pressure

$s$

Specific entropy

$\mathit{s}$

Relativistic interval

$u_k$

Four velocity

$\ensuremath{v}$

Velocity

$w$

Specific enthalpy

$\alpha$

Mach angle

$\gamma$

Lorentz factor

$\kappa$

Polytropic index

$\rho$

Mass density

$\sigma$

Proper specific entropy

$\omega$

Proper specific enthalpy

$\epsilon$

Specific internal energy

Latin indices: $\left\{a, b,\ldots \right\}$

Take values $0, 1, 2, 3,$

Greek indices: $\left\{\alpha, \beta,\ldots \right\}$

Take values $1, 2, 3,$