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Dec
8
answered de morgan law $A\setminus (B \cap C) = (A\setminus B) \cup (A\setminus C) $
Dec
5
asked Let $T$ be a spanning tree. Prove that for cycles $C,D$, $E(C)\backslash E(T) = E(D)\backslash E(T)\implies C=D$
Dec
5
answered Is there a proof for Archimedes' pictorial proof for the approximation of pi?
Dec
4
answered Proof that a circle has an infinite number of tangents
Nov
29
asked $f$-factors and fractional $f$-factors and odd cycles
Nov
6
asked Prove that the number of pairs of edges that cross in a drawing of $K_n$ is at least $\frac{1}{5}\binom{n}{4}$ (for $n\geq 5$)
Oct
23
answered Proof by Induction for a recursive sequence and a formula
Oct
20
answered What is that sign in the context of vectors?
Oct
18
asked Prove for a connected graph $G=(V,E)$, $\kappa(G)=1+\min_{v\in V}\kappa(G-v)$
Oct
17
answered Covering a chess board with $2$ missing places with $31$ dominoes
Oct
17
answered Is 9/1 an improper fraction?
Oct
17
answered geometric description of subsets that form bases in $\mathbb R^2$ and $\mathbb R^3$
Oct
17
asked I have a recursively defined function, and another function involving powers of a matrix. How can I show that they are equal?
Oct
8
answered If a linear system has no free variables, then it is consistent: Why is the statement false?
Oct
8
answered Given f(x) find the inverse function and its domain and range
Oct
8
answered How do I proove the symmetry of Metric space?
Oct
8
asked Prove that flow is a linear combination of flow cycles and flow paths
Oct
5
asked Help with a step in Diestel's proof of Tutte's theorem in Graph Theory
Sep
19
asked If $X\sim \exp(\lambda)$ and $Y\sim \exp(\mu)$ then $P(X\leq Y)=\frac{\lambda}{\lambda+\mu}$. Is there an intuitive interpretation for this fact?
Sep
4
answered What does the sentence “The only sub-algebras of $\mathbb{R}^{2}$ are $0,\mathbb{R}^{2},\mathbb{R}(0,1),\mathbb{R}(1,0),\mathbb{R}(1,1)$” mean?