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12h
comment Text suggestion for linear algebra and geometry
@5space People in MSE are not reading the body of the question anymore. They read only what you put in the title. I've noticed this a lot in my questions.
12h
comment Show that the number of subsets of $S_1 \cup \dots \cup S_t$ that contain at most one element from each $S_i$ is $(a_1 + 1)(a_2 + 1) \dots (a_t + 1)$.
But is it possible to derive some reasoning from the generating functions?
12h
comment Show that the number of subsets of $S_1 \cup \dots \cup S_t$ that contain at most one element from each $S_i$ is $(a_1 + 1)(a_2 + 1) \dots (a_t + 1)$.
But is it possible to derive some reasoning from the generating functions?
1d
comment How to solve this kind of problem?
@brick Anything, I guess. I'm not sure if the operations have prority. I just found this randomly on the internet, there were no instructions.
1d
comment Continuity of Modified Hom Functor
My eyes switched the letters in my first read. I read Mom Functor.
2d
comment Blackboard bold, Bold, Fraktur, and Reserved Variable.
Probably because it's easier to type. **R** is easier than $\mathbb{R}$.
2d
comment Does $\frac{0}{0}$ really equal $1$?
It's actually possible to divide by zero. Take a look at my answer.
2d
comment Does $\frac{0}{0}$ really equal $1$?
It's actually possible to divide by zero. Take a look at my answer.
2d
comment Does $\frac{0}{0}$ really equal $1$?
@ConorO'Brien It involves a little bit of abstract algebra, if you're interested (and are able to read mathematics books) take a look at some introduction to abstract algebra. For starters, I guess that Pinter's: A book of algebra or Stillwell's: Elements of Algebra are good calls.
Dec
17
comment How does $\mathcal{A}\cup \mathcal{B}$ indicates that there is at least one augmenting path on $\mathcal{A}$?
Good. I tried to think about it (in the exam) but I didn't imagined the coloring. I tried to think that the matchings $\mathcal{A}$ and $\mathcal{B}$ were disjoint and tried to answer with this. But I noticed that when they happen to be not disjoint, I'd have problems.
Dec
6
comment Is it possible to solve problems about finding the number of solutions to a linear equation with the multinomial coefficient?
@Lucian No, I'm not asking how to solve it. I'm asking if it's possible to solve it using multinomial coefficients.
Dec
6
comment Is it possible to solve problems about finding the number of solutions to a linear equation with the multinomial coefficient?
@AndréNicolas Not distinguishable.
Dec
3
comment Are there two notions of flow?
Good. When I read that a flow is $f:E\to \mathbb{R}_0^+$, I tend to presume that it is the quantity of flow passing through a vertex $e$.
Dec
3
comment Why does the terminal set have exactly one element?
Oh, thanks. But what's the problem of using the familiar notion of mapping?
Nov
28
comment How $a_{13}=0$ in $\begin{bmatrix} {2}&{1}&{0}\\ {1}&{3}&{5} \end{bmatrix}$?
Yes, but wouldn't you deduce it from that figure?
Nov
28
comment How $a_{13}=0$ in $\begin{bmatrix} {2}&{1}&{0}\\ {1}&{3}&{5} \end{bmatrix}$?
Yes, that's why I asked if it spins. I showed the reason why I thought that.
Nov
28
comment How $a_{13}=0$ in $\begin{bmatrix} {2}&{1}&{0}\\ {1}&{3}&{5} \end{bmatrix}$?
@Ilya Here.
Nov
28
comment How $a_{13}=0$ in $\begin{bmatrix} {2}&{1}&{0}\\ {1}&{3}&{5} \end{bmatrix}$?
Yes, but I am confronting that information with another information given in the book.
Nov
28
comment Why $f^{+}(v)-f^-(v) =val(f)$ if $v$ is the source?
@Casteels I guess that I thought something I'm unable to explain. But as a pointed in the text, I guess I understood it right now.
Nov
28
comment Why $f^{+}(v)-f^-(v) =val(f)$ if $v$ is the source?
@Casteels Reverse? How? I thought that I had to think about arrows incoming to the source, but then I guessed that it's not possible to have arrows incoming to the source (or at least, in most of the cases, that doesn't happen).