Jan 15, 2013Β Β· Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$. Can you think. Mar 30, 2020Β Β· 1 Short Answer Yes AA -1 = A -1 A = I when the Det (A) β‰  β‰  0 and A is a square matrix. Long Answer A matrix is basically a linear transformation applied to some space. For the sake of. @coffeemath Debatable: you can write Hn = S2 n + 1 n! Where S denotes Stirling numbers of the first kind. But it may not be considered a "closed form", since Stirling numbers are not much more easy.

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