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1. CMB 2005 (vol 48 pp. 267)

Rodman, Leiba; Ċ emrl, Peter; Sourour, Ahmed R.
Continuous Adjacency Preserving Maps on Real Matrices
It is proved that every adjacency preserving continuous map on the vector space of real matrices of fixed size, is either a bijective affine tranformation of the form $ A \mapsto PAQ+R$, possibly followed by the transposition if the matrices are of square size, or its range is contained in a linear subspace consisting of matrices of rank at most one translated by some matrix $R$. The result extends previously known theorems where the map was assumed to be also injective.

Keywords:adjacency of matrices, continuous preservers, affine transformations
Categories:15A03, 15A04.

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