Immutability of Affine Connections

[mjungmath]

See #30261.

In this ticket, we introduce immutability to affine connections. Also, we fix the buggy hash function.

Depends on #30285

Component: manifolds

Author: Michael Jung

Branch/Commit: 28431c0

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/30280

[mjungmath]

Dependencies: #30281

[mjungmath]

Description changed:

--- 
+++ 
@@ -1 +1,3 @@
+See #30261.
 
+In this ticket, we introduce immutability to affine connections. Also, we fix the buggy `hash` function.

[mjungmath]

Branch: u/gh-mjungmath/immutability_of_affine_connections

[mjungmath]

comment:3

Two things are strange here. First, the test suite starts a pickling test, that didn't happen before. Secondly, for some reason is_immutable() does not invoke properly. The doctests fail.

I have uploaded my code. Can someone please take a short look?

---

New commits:

f0230f0	Trac #30281: `__reduce__` method removed
c11d29c	Trac #30280: immutability for affine connections

[mjungmath]

Commit: c11d29c

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

5156c5e

Trac #30280: Mutability inheritance removed + hash function improved

[sagetrac-git]

Changed commit from c11d29c to 5156c5e

[mjungmath]

comment:5

I have no idea what the problem was. Until this is resolved, I propose to remove the inheritance and implement the immutability manually, see last commit.

[mjungmath]

Author: Michael Jung

[mjungmath]

Changed dependencies from #30281 to none