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 Yearling
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May
7
comment Minimum possible number of vertices in a tree with restrictions on vertex degree
One can add that if we have a sequence of numbers satisfying the handshaking lemma for a tree then it is always realizable.
May
7
comment Minimum possible number of vertices in a tree with restrictions on vertex degree
Hint: Consider a tree with 1994 vertices where all but the 22 mentioned vertices are of degree 1.
May
7
comment Is there an intuitive, not-too-mathematical way of thinking about limit points?
You can interpret a limit point as a limit of some sequence in $A$. (As you are working in $\mathbb R$ which is a metric space.) That intuitively justifies the name limit point.
May
7
answered Is there an intuitive, not-too-mathematical way of thinking about limit points?
May
7
comment finding roots when polynomial does not equal zero
math.ucdavis.edu/~kkreith/tutorials/sample.lesson/cardano.html
May
6
comment Let $A$ is nonsingular and each eigenvalue of $A$ is either $+1$ or $-1$.Why $A$ is similar to ${A^{ - 1}}$?
Similar implies same eigen values but the converse need not be true.
May
6
awarded  Yearling
May
6
comment How many ways can $133$ be written as sum of only $1s$ and $2s$
Let $T_n$ be the number of ways to represent a number $n$ in ones and twos. Now, each way is counted if we consider a way of $T_{n-1}$ and add one, or if we consider a way of $T_{n-2}$ and add two. So $T_n=T_{n-1}+T_{n-2}$.
May
5
reviewed Approve Why is this function not an inner product space?
May
5
revised A problem on pigeonhole principle
added 166 characters in body
May
5
revised A problem on pigeonhole principle
added 32 characters in body
May
5
answered A problem on pigeonhole principle
Apr
27
comment Linear programming right hand side is abstract
Why not take $a$ on the left hand side, so that you have equations of the form $x_1+x_2-a\le 0$.
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.