Prove that the main diagonal of a skew-symmetricmatrix must consist entirely of zeros.

L23 - 3 Extreme Value Theorem: If f is continuous on a closed interval [a,b], then f has at some numbers c and d in [a,b]. a b 1 ex. Find the absolute extrema of f(x)= on [−1,1]. x ✻ ✛ ✲ ❄