The trace of a square matrix A is defined as the:
The trace of a square matrix A is defined as the:
- A. Product of its diagonal elements
- B. Sum of all its elements
- C. Sum of its principal diagonal elements
- D. Product of non-zero elements
Answer: C) Sum of its principal diagonal elements
Explanation: The trace of an n × n matrix is the sum of its main diagonal elements: a(1,1) + a(2,2) + ... + a(n,n).
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