### The difference-of-Hadamard lift of the 1-norm regularizer enjoys \(2 \Rightarrow 1\)

nonconvex

lift

sparse

### The usual smooth lift of the nuclear norm regularizer enjoys \(2 \Rightarrow 1\)

nonconvex

lift

rank

### Saddle avoidance and stable manifold: a proof from first principles for a simple setup

nonconvex

saddles

CSMT

### Benign landscape of low-rank approximation: Part II

nonconvex

rank

### Small geodesic triangles

manifolds

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