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
Determinant Determinant as signed volume under multiplication by elementary matrices.	Determinant as signed volume under multiplication by elementary matrices
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
Shear mapping — Higher dimensions Animated 3D example of elementary shear of x by y.	3D elementary shear of x by y
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)
Rodrigues' rotation formula — Derivation Animation of vector rotation around an axis using Rodrigues' rotation formula.	Rodrigues rotation formula animation
Rodrigues' rotation formula — Matrix notation Step-by-step geometric construction of Rodrigues' rotation formula.	Rodrigues rotation formula steps diagram
Axis–angle representation — Example Animated cube rotation illustrating axis–angle representation.	Axis-angle representation of a cube rotation
Gaussian elimination — Definitions and example of algorithm Row reduction interpreted as multiplication by elementary matrices.	Gaussian elimination as multiplication by elementary matrices
Gaussian elimination — Row operations Row reduction interpreted as changes in the row normal planes under multiplication by elementary matrices.	Gaussian elimination as multiplication by elementary matrices - row view
System of linear equations — Row reduction Animated row-normal-plane view of row reduction for a linear system.	Row reduction of a linear system - row normal planes animation

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.

Selected GraphMath articles are also available on Medium.

GraphMath on Medium
GraphMath publication for articles and essays on linear algebra and geometric explanation.

Why changing a regression model changes the projection
Article on how model changes alter the projection in least squares geometry.