10.1184/R1/6586370.v1 Alessandro Rinaldo Alessandro Rinaldo A Note on the Uniqueness of the Lasso Solution Carnegie Mellon University 2002 Statistics Probability 2002-12-13 00:00:00 Journal contribution https://kilthub.cmu.edu/articles/journal_contribution/A_Note_on_the_Uniqueness_of_the_Lasso_Solution/6586370 <p>In this note we show that, if β₁ and β₂ are two distinct solutions to the lasso problem min<sub>β∈Rp</sub>∥ y - Xβ∥2^2 + λ∥β∥1 for some n × p matrix X with p > n, then Xβ1 = Xβ2.</p>