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Transformations of digital spaces preserving local and global topology playan important role in thinning, skeletonization and simplification of digitalimages. In the present paper, we introduce and study contractions of simplepair of points based on the notions of a digital contractible space andcontractible transformations of digital spaces. We show that the contraction ofa simple pair of points preserves local and global topology of a digital space.Relying on the obtained results, we study properties if digital manifolds. Inparticular, we show that a digital n-manifold can be transformed to itscompressed form with the minimal number of points by sequential contractions ofsimple pairs.  Key Words: Graph, digital space, contraction, splitting, simple pair,homotopy, thinning

Simple pairs of points in digital spaces. Topology-preserving transformations of digital spaces by contracting simple pairs of points