pystein.symbols module

Module for commonly used symbols, such as coordinate symbols. This prevents unnecessary duplicate calls to sympy.symbols and provides unified access to reoccurring symbols.

class pystein.symbols.CoordinateSymbol

Bases: object

An enumeration of commonly used coordinate symbols

CartesianX = x

CartesianY = y

CartesianZ = z

SphericalAzimuthalAngle = \varphi

SphericalPolarAngle = \theta

SphericalRadius = r

Time = t

class pystein.symbols.CurvatureSymbol

Bases: object

An Enumeration of commonly used curvature symbols

ConstantCurvature = k

class pystein.symbols.MatterSymbol

Bases: object

An Enumeration of commonly used matter symbols

Density = \rho

Pressure = p

pystein.symbols.numeric_symbol(name: str, assumptions: Optional[dict] = None)

Helper utility for creating a numeric symbol with default assumptions from the sympy.diffgeom subpackage

Parameters

name – str, the name
assumptions – dict, the assumptions. If None use DEFAULT_NUMERIC_ASSUMPTIONS

Returns

Symbol