Mar (Mathematical Art Representation) is a system developed by Nelson J. Diaz a visual physicist in the 1980s. It utilizes supercomputers and conformal mapping in complex mathematics to explore mechanisms in three-dimensional (3D) and four-dimensional (4D) applications of pictorial space, particularly in the context of Francis Bacon's paintings or Leonardo da Vinci's use of central perspective.

Nelson J. Diaz, a published scholar associated with the MIT Press Leonardo journal, is a leading expert on Francis Bacon and a pupil of Bacon from 1985-1988 on developing a language of non-Euclidean geometry in a (4D) in postmodern art.

. Diaz analyzes Bacon's brush strokes as exhibiting non-Euclidean behavior, providing a particular spatial and content manifold.

Diaz offers peer-reviewed research that establishes a solid foundation for provenance, essential for issuing a Certificate of Authenticity (COA).