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Principal Minors - From the previous blog post, we know that a function is convex if all the principal minors are greater than or equal to zero i.e. Δₖ ≥ 0 ∀ k compute Δ₁ - Principal Minors of order 1 (Δ₁) can be obtained by deleting any 3–1 = 2 rows and corresponding columns. By deleting row 2 and