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3 along with corresponding columns Δ₁ = x₁² By deleting row 1 and 3 along with corresponding columns Δ₂ = x₂² By deleting row 1 and 2 along with corresponding columns Δ₃= x₃² compute Δ₂ - Principal Minors of order 2 can be obtained by deleting any 3–2 = 1 row and corresponding column. By deleting