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Dec
14
asked Necessary and sufficient condition so an edge-weighted complete graph has even weight on all cycles
Dec
11
answered Finding number of paths between vertices in a graph
Dec
10
answered existing of limiting point and delta exist
Dec
10
answered How to calculate the a Probability with Z-Score.
Dec
8
answered Prove that $S = \left \{(x, y) \in \mathbb{N} \times \mathbb{R}: xy = 1 \right\}$ is denumerable
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 Prove 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