Matemática Ciencias Exactas Majorization Frames MATEMATICAS ANALISIS MATEMATICO CONICET Fusion frames Matemáticas UBA Aluthge transform Convex potentials Frame completions Hadamard product Lidskii's inequality Oblique projections Polar decomposition Positive operators Angles Dual reconstruction systems Norm inequalities Reconstruction systems Riesz frames Shorted operator Similarity orbit Spectral order Stable manifold theorem 47A30 47B15 Algebra