ANGLE BETWEEN SUBSPACES 3 ANGULOS ENTRE SUBESPACIOS 3 BASES DE RIESZ 3 CONCENTRATION INEQUALITIES 3 DESIGUALDADES DE CONCENTRACION 3 DIMENSIONALITY REDUCTION 3 ESPACIOS INVARIANTES POR TRASLACIONES ENTERAS 3 FIBERS 3 FIBRAS 3 FRAMES 3 GRAMIAN OPERATOR 3 MARCOS 3 MUESTREO 3 OPERADOR GRAMIANO 3 REDUCCION DIMENSIONAL 3 RIESZ BASES 3 SAMPLING 3 SHIFT-INVARIANT SPACES 3 Concentration inequalities 2 Dimensionality reduction 2 Projective clustering 2 Random matrices 2 Sparsity 2