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visits member for 1 year, 3 months
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Kids in rectangles irritating sick urchins rattling foxes, directory.kirisurf.org lol


Oct
5
asked Having trouble understanding this proposition from my textbook.
Oct
1
accepted Is matrix multiplication by an invertible matrix one-to-one and onto?
Oct
1
comment Is matrix multiplication by an invertible matrix one-to-one and onto?
What about $f(X)=XA$?
Oct
1
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.
Oct
1
asked Is matrix multiplication by an invertible matrix one-to-one and onto?
Sep
18
comment Confusing DE concept question
Define "reduced".
Sep
17
awarded  Citizen Patrol
Sep
12
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?
Sep
10
accepted Proving that similar matrices have identical ranks
Sep
9
asked Proving that similar matrices have identical ranks
Sep
5
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"...
Aug
25
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.
Aug
25
comment Paradoxes without self-reference?
Also this is not actually a paradox but a misunderstanding of infinite series.
Aug
16
comment Is this a new function?
There are an infinite amount of functions to "discover."
Aug
15
asked Is probability and the Law of Large Numbers a huge circular argument?
Aug
12
awarded  Investor
Aug
12
accepted Keep on getting wrong value for linear regression $\beta$ estimator derivation
Aug
10
comment Does the series $1 + \frac{1}{2} - \frac{1}{3} + \frac{1}{4} + \frac{1}{5} - \frac{1}{6} + \dots$ converge?
This series actually converges by the alternating series test. This is a theorem that states that if an infinite series is alternating, then it converges iff the $n^{\text{th}}$ term goes to $0$ as $n$ goes to $\infty$.
Aug
8
accepted Is this the correct way to derive the generating series?
Aug
8
accepted Generating functions for election results