This ticket adds the method apply_map to the class TensorField, which applies a function to the coordinate expressions of all components of a tensor field in a given vector frame.
This allows operations like factorization, expansion, simplification or substitution to be performed on the components.

Such a method has been requested in e.g. https://ask.sagemath.org/question/42107/basic-work-on-tensor-components/ and was discussed again during Sage Days 107.

CC: @tscrim

Component: geometry

Keywords: tensor, components, sd107

Author: Eric Gourgoulhon

Branch/Commit: 5cf7fc5

Reviewer: Vincent Delecroix, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/29244