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selfAdjoint
#2
Dec2-03, 11:12 AM
Emeritus
PF Gold
P: 8,147
For the first one, study the definition your book or notes gives for "nonsingular". Look at it again. How does that definition bear of the product AB = 0?

For the second one, do they give you a method for finding the inverse of a square matrix? What happens in that method when aij = aji for all i and j?