External Presence

Selected GraphMath visualizations have been uploaded to Wikimedia Commons and incorporated into specific sections of Wikipedia articles.

Wikipedia article section	Wikimedia Commons file
Projection (linear algebra) — Orthogonal projections Projection onto a subspace shown geometrically.	Least squares projection geometry
Projection (linear algebra) — Finding projection with an inner product Projection using orthonormal basis and inner products.	Orthogonal projection using an orthonormal basis
Ordinary least squares — Projection Least squares as projection onto the column space.	Geometric interpretation of least squares (three observations)
Row and column spaces — Relation to the left null space Diagram of the four fundamental subspaces.	Four fundamental subspaces of a matrix (diagram)
Change of basis Coordinate change between the standard basis and a new basis.	Change-of-basis coordinate mapping (matrix representation)
Change of basis Coordinate transformation between two non-standard bases.	Change of basis — coordinate transformation between bases
QR decomposition — Square matrix Gram-Schmidt orthogonalization and upper-triangular structure.	QR decomposition geometric interpretation (2D)
QR decomposition — Example 3D geometric interpretation of QR factorization.	QR decomposition geometric interpretation (3D)
Gaussian elimination — Definitions and example of algorithm Row reduction interpreted as multiplication by elementary matrices.	Gaussian elimination as multiplication by elementary matrices

GraphMath materials are also available through public repositories and long-term archives.

GitHub repository
Source materials, diagrams and structured content are published in a public repository.

Zenodo DOI archive
Selected GraphMath materials are archived on Zenodo for long-term access and citation.

Selected GraphMath materials are also listed on public educational platforms.

OER Commons — Geometric Interpretation of Least Squares (OLS)
Public OER listing for the least squares resource.

MERLOT materials
Public MERLOT listing for GraphMath Linear Algebra educational resources.