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visits member for 2 years, 10 months
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14h
asked What happens from $\displaystyle (1+(x+x^2))^n$ to $\displaystyle \sum_k {n \choose k} (x+x^2)^n$?
1d
asked 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 $(a_1 + 1)(a_2 + 1) \dots (a_t + 1)$.
2d
asked How to solve this kind of problem?
Dec
18
asked Could you expand a little on this proof or Floyd-Warshall Algorithm?
Dec
18
asked What's the meaning of “reuse space”?
Dec
17
answered Does $\frac{0}{0}$ really equal $1$?
Dec
17
answered is there a discipline of mathematics that studies graphical versions of various operations?
Dec
17
asked How does $\mathcal{A}\cup \mathcal{B}$ indicates that there is at least one augmenting path on $\mathcal{A}$?
Dec
10
asked What is $F_P$ and $E(P)$?
Dec
6
asked Is it possible to solve problems about finding the number of solutions to a linear equation with the multinomial coefficient?
Dec
3
asked How do we define interior and exterior of a geometric figure?
Dec
3
asked Question about a method in elementary combinatorics.
Dec
3
asked How many ways can 25 red balls be put into 3 distinguishble boxes if no box is to contain more than 15 balls?
Dec
3
asked Are there two notions of flow?
Dec
3
asked Why does the terminal set have exactly one element?
Nov
28
asked How $a_{13}=0$ in $\begin{bmatrix} {2}&{1}&{0}\\ {1}&{3}&{5} \end{bmatrix}$?
Nov
28
answered Why $f^{+}(v)-f^-(v) =val(f)$ if $v$ is the source?
Nov
28
asked Why $f^{+}(v)-f^-(v) =val(f)$ if $v$ is the source?
Nov
27
answered Easy to read books on Graph Theory
Nov
27
asked How many words can be written with $aabbbccdd$ such that no two equal letters are adjacent?