user54609
Reputation
830
Top tag
Next privilege 1,000 Rep.
Create tags
 Oct29 comment Completely baffled by this question involving putting matrices in matrices Ahh thanks. I was trying to concoct $R$ using multiplications and sums of things involving $P$ and $Q$... Also, is there some trick to intuitively "getting" matrix multiplication? Like, I can calculate it, but I can never eyeball even a very high-level picture of what happens to various properties when you multiply two matrices. Oct29 accepted Completely baffled by this question involving putting matrices in matrices Oct29 comment Completely baffled by this question involving putting matrices in matrices C is $m\times n$. Oct29 asked Completely baffled by this question involving putting matrices in matrices Oct10 accepted Having trouble understanding this proposition from my textbook. Oct5 comment Having trouble understanding this proposition from my textbook. But can't $\vec{y}$ be of the wrong dimension to multiply by $A$? After all, it is formed with $A_B$, which has different dimensions from $A$. Oct5 asked Having trouble understanding this proposition from my textbook. Oct1 accepted Is matrix multiplication by an invertible matrix one-to-one and onto? Oct1 comment Is matrix multiplication by an invertible matrix one-to-one and onto? What about $f(X)=XA$? Oct1 comment Is matrix multiplication by an invertible matrix one-to-one and onto? Yes, but how about the "inverse" multiplication? Also, $X$ is a matrix, not a vector. Oct1 asked Is matrix multiplication by an invertible matrix one-to-one and onto? Sep18 comment Confusing DE concept question Define "reduced". Sep17 awarded Citizen Patrol Sep12 comment Are there “numbers” with infinite number of digits (to the left) and are they useful? Maybe start with something simple: how would you convert such a number from decimal to binary for example? Sep10 accepted Proving that similar matrices have identical ranks Sep9 asked Proving that similar matrices have identical ranks Sep5 comment Why do you add +1 in counting test questions? It's sad to see "add 1 to counting test problems" being taught as one of those "rules"... Aug25 comment Paradoxes without self-reference? The liar paradox and also the "set of all sets" paradox seem to be true paradoxes, revealing incompleteness of certain systems of logic or set theory. Aug25 comment Paradoxes without self-reference? Also this is not actually a paradox but a misunderstanding of infinite series. Aug16 comment Is this a new function? There are an infinite amount of functions to "discover."