# A Matrix Problem

Algebra Level 3

$(1$) The elements on the main diagonal of a symmetric matrix are all zero.

$(2$) The elements on the main diagonal of a skew-symmetric matrix are all zero.

$(3$) For any square matrix $A, \dfrac{1}{2}(A + A')$ is skew-symmetric.

$(4$) For any square matrix $A, \dfrac{1}{2}(A - A')$ is skew-symmetric.

Which of the following statements are correct?

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