Paul Accisano
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 Sep 18 comment How does adding extra row and column of ones affect a matrix's inverse? Sorry, I meant $D$ in the wiki article, ie, the the component in the lower right, ie 0. The linked question is more than sufficient to answer my question. Thanks for the helpful replies. Sep 18 comment How does adding extra row and column of ones affect a matrix's inverse? Computing the Schur complement requires that $D$ (ie, the component in the lower right) be invertable, which it isn't... EDIT: Or at least that's what my cursory reading of the wiki article says. Your linked comment is much more helpful. Thanks! Sep 18 comment How does adding extra row and column of ones affect a matrix's inverse? I have tried that. It's difficult to see any relation... but I guess I don't know what to look for. Sep 18 asked How does adding extra row and column of ones affect a matrix's inverse? Nov 1 awarded Supporter Nov 1 awarded Scholar Nov 1 accepted $f\colon X \to Y \times Z$ is continuous iff its component functions are Nov 1 comment $f\colon X \to Y \times Z$ is continuous iff its component functions are Ah, that "every open set in $X \times Y$ is a union of 'rectangular open sets'" bit is the part I didn't see. Many thanks =) Nov 1 awarded Student Nov 1 comment $f\colon X \to Y \times Z$ is continuous iff its component functions are Um, please reopen my question... The linked question addresses the forward direction only; my question involves the converse... Nov 1 asked $f\colon X \to Y \times Z$ is continuous iff its component functions are