Physics · Quantum Mechanics
Consider a 4-dimensional vector space V that is a direct product of two 2-dimensional vector spaces V1 and V2. A linear transformation A acting on V is specified by the direct product A = A1 ⊗ A2, where A1 and A2 act on V1 and V2 respectively. In a particular basis, A1 has eigenvalues 1 and 3, and A2 has eigenvalues 2 and 4. What is the lowest eigenvalue of A?
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