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4h
answered If $G$ is abelian, it has a subgroup in every order of $|G|'s$ divisors?
18h
answered Pythagorean theorem expressed without roots in an old Tamilian (Indian) statement
19h
answered Proof for coloring combinations problem. (color vertices of pentagon)
20h
answered Let $n$ be a positive integer and $S$ the set of points $(x,y)$ in the plane, where $x$ and $y$ are non-negative integers such that $x + y < n$.
21h
answered Probability Of People Visiting Pubs
22h
answered A grasshopper starts at the origin and is equally likely to hop north,s,e,w. What is the probability that it's coordinates will be 0,0 after 4 hops?
22h
answered Golf Question when you have uneven players teams how can you make it simple and fair
22h
asked 2014 IMC first problem first day (eigenvalues of a product of symmetric matrices).
22h
answered Find all numbers that have 30 factors and have 30 as one of their factors.
23h
answered Show that $G:=\mathbb{Z}_{13}^*$ is cyclic
1d
answered Ordering Books On a Shelf
1d
answered Number Theory or Abstract Algebra first?
1d
answered Prove that the graph dual to Eulerian planar graph is bipartite.
1d
answered How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
2d
answered What the difference between the smallest two numbers from these numbers?
Jul
2
answered Proof that if a simple Graph contains at most two nodes with odd degree then it has a Euler walk
Jul
2
answered Is there a connection between lattices in the sense of orders and lattices in the sense of groups?
Jul
1
answered prove that this number contains two equal digits
Jul
1
answered Add or subtracts 1 to 9 numbers and get the answer 100
Jul
1
answered prove that $\dfrac{\left( 5^{125}-1\right)}{\left( 5^{25}-1\right)}$ is composite number