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Apr
22
accepted Dual graph of a tree
Apr
22
comment Dual graph of a tree
I'm confused. What is the correct definition of a dual graph? How are its edges defined?
Apr
21
answered Simple Linear Algebra Question about consistency of a linear system
Apr
21
comment Determinant of a 5 × 5 matrix
What is the determinant for $n=4,5$? Maybe you could conjecture the result and then use induction.
Apr
21
asked Dual graph of a tree
Apr
20
asked The number of edges in a tree is $n-1$
Apr
8
asked Multiplicative inverse in terms of dedekind cuts.
Apr
7
reviewed Reject Is $cos(\bar z)$ analytic anywhere on complex plane?
Apr
7
comment Number of elements in a ring such that $x^2=1$
No. There is at least another, 94. I reasoned this from noting that $x^2=1$ implies $(x-1)(x+1)=0$ and this is true if $x=-1=94$.
Apr
7
awarded  Nice Question
Apr
6
comment Calculus book with interesting examples
Related: math.stackexchange.com/questions/63504/…
Apr
6
revised Elementary Combinatorial Proofs using group action
edited body
Apr
3
revised Elementary Combinatorial Proofs using group action
correction
Apr
3
revised Advice on mathematical cources and profession
corrected spelling
Apr
3
revised Proving that the dihedral group $D_n$ has $2n$ elements
added 86 characters in body
Apr
2
revised Proving that the dihedral group $D_n$ has $2n$ elements
added 158 characters in body
Apr
2
revised Proving that the dihedral group $D_n$ has $2n$ elements
included my attempt
Apr
2
comment Proving that the dihedral group $D_n$ has $2n$ elements
Or rather $\{Id,\tau\sigma^{x-1}\}$?
Apr
2
reviewed Approve Probability of Disjoint Hands Across Rounds of Cards
Apr
2
comment Proving that the dihedral group $D_n$ has $2n$ elements
Geometrically it is clear, but what will be the stabilizer in terms of the dihedral group as I have defined it? Will it be $\{Id,\tau\sigma^x\}$?