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seen Apr 17 at 6:46

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