Abstract
By means of the Dirac procedure, we re-examine Yang's quantized space-time model, its relation to Snyder's model, the dS special relativity and their UV–IR duality. Starting from a dimensionless dS5-space in a (5+1)-dimensional Mink-space a complete Yang model at both classical and quantum level can be presented and there really exists Snyder's model, the dS special relativity and the duality.
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