From a6268f04195087f1fcb1dda6ba174e41add7796c Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 3 Oct 2025 12:22:42 +0000
Subject: [PATCH 1/3] Initial plan


From cefe34cd8b11bedd09d56dff44f5a25299a5ac7a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 3 Oct 2025 12:45:53 +0000
Subject: [PATCH 2/3] Add v0.15 changelog entry for MatrixAlgebraKit backend

Co-authored-by: lkdvos <37111893+lkdvos@users.noreply.github.com>
---
 Changelog.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Changelog.md b/Changelog.md
index b6ea4c24f..4ef861efd 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -15,6 +15,29 @@ Features that are planned to be implemented before the release of v1.0.0, in no
 
 # Changelog
 
+## v0.15
+
+### MatrixAlgebraKit backend for factorizations
+
+This version introduces [MatrixAlgebraKit](https://github.com/QuantumKitHub/MatrixAlgebraKit.jl) as the new backend for tensor factorizations, replacing the previous internal `TensorKit.MatrixAlgebra` implementation. See [#230](https://github.com/QuantumKitHub/TensorKit.jl/pull/230) for details.
+
+#### Added
+- `foreachblock(f, t::AbstractTensorMap...)` - uniform interface to iterate through tensor blocks (prepares for future multithreading support)
+- `eig_trunc` and `eigh_trunc` - truncated eigenvalue decompositions
+- `ominus` (and unicode `⊖`) - compute orthogonal complement of a space
+- Backend selection for factorizations - swap algorithms or implementations
+
+#### Changed
+- Factorization functions `leftorth`, `rightorth`, `tsvd`, `eig`, `eigh` deprecated in favor of MatrixAlgebraKit variants (`left_orth`, `right_orth`, `tsvd`, `eig`, `eigh`)
+- Truncation strategies now use MatrixAlgebraKit names: `truncrank` (replaces `truncdim`), `truncbelow` (replaces `trunctol`)
+- `left_orth` and `right_orth` now always output tensors with a single connecting space
+- `left_orth` and `right_orth` now always have connecting space with `isdual=false`
+
+#### Removed
+- `OrthogonalFactorization` structs (constructors deprecated to return equivalent MatrixAlgebraKit algorithm structs)
+- Direct permute-and-factorize operations (incompatible with `permute` vs `braid` distinction)
+- `Polar` decomposition behavior for `left_orth`/`right_orth` (use `left_polar`/`right_polar` instead for `isposdef` R factors)
+
 ## v0.14
 
 ### Use `DiagonalTensorMap` for singular values and eigenvalues

From 63ed6e4317769a31567d6a98fb62585b6c324124 Mon Sep 17 00:00:00 2001
From: Lukas Devos <ldevos98@gmail.com>
Date: Fri, 3 Oct 2025 09:57:00 -0400
Subject: [PATCH 3/3] Revise Changelog for recent updates and removals

Updated changelog to reflect recent changes and deprecations.
---
 Changelog.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Changelog.md b/Changelog.md
index 4ef861efd..3ea7a515e 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -32,6 +32,7 @@ This version introduces [MatrixAlgebraKit](https://github.com/QuantumKitHub/Matr
 - Truncation strategies now use MatrixAlgebraKit names: `truncrank` (replaces `truncdim`), `truncbelow` (replaces `trunctol`)
 - `left_orth` and `right_orth` now always output tensors with a single connecting space
 - `left_orth` and `right_orth` now always have connecting space with `isdual=false`
+- code formatter is now [Runic.jl](https://github.com/fredrikekre/Runic.jl)
 
 #### Removed
 - `OrthogonalFactorization` structs (constructors deprecated to return equivalent MatrixAlgebraKit algorithm structs)
@@ -118,4 +119,4 @@ where all blocks and subblocks are various views into this object. This entails
 simplifications for the outwards-facing interface, as now the `TensorMap` type requires less
 parameters, and the fusion-tree structure is more clearly considered as an implementation
 detail that can be left hidden to the user. Various other improvements and documentation
-work was also carried out.
\ No newline at end of file
+work was also carried out.