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BMBM
  • Member for 7 years, 7 months
  • Last seen more than a week ago
17 votes
2 answers
66k views

Proof that the sum of all degrees is equal to twice the number of edges

16 votes
9 answers
4k views

Intuition behind logarithm change of base

12 votes
1 answer
18k views

Proof - raising adjacency matrix to $n$-th power gives $n$-length walks between two vertices

9 votes
3 answers
2k views

Amount of numbers not divisible by 7 in Pascals Triangle without iteration

8 votes
2 answers
22k views

Moving index in a summation - how does that work?

7 votes
4 answers
31k views

Understanding proof for $e \leq 3v - 6$ in planar graphs

7 votes
2 answers
867 views

All vertices have degree 3 but graph is only 4-edge-colorable?

4 votes
3 answers
478 views

Understand part of a proof to show that if K is normal in G, then K is the kernel of a homomorphism

4 votes
1 answer
21k views

5-color Theorem proof

4 votes
1 answer
5k views

What is the graph width?

3 votes
2 answers
829 views

Proof that a Octahedron graph is 3-colorable?

3 votes
1 answer
19k views

A connected graph has an Euler circuit if and only if every vertex has even degree.

3 votes
2 answers
859 views

Understanding proof why there can only be one triangle for $a^2 + b^2 = c^2$

3 votes
2 answers
155 views

Number of onto functions, why does my solution not work?

3 votes
2 answers
677 views

Equation of secant line in mean value theorem proof

3 votes
3 answers
616 views

Understanding general case of parabola equation

3 votes
5 answers
110 views

Find if terms are terms of the same arithmetic progression

3 votes
3 answers
356 views

Understand proof of lemma about existence/uniqueness of group generated by a set

3 votes
3 answers
116 views

Does the series $\sum n!/(n+2)!$ diverge or converge?

3 votes
2 answers
59 views

How to find functions in order to apply Squeeze Rule for continuous functions

3 votes
3 answers
6k views

Sequential definition of continuity: What does "all sequences mean

2 votes
4 answers
699 views

If $H$ is a union of conjugacy classes, then $gH = Hg$?

2 votes
1 answer
197 views

Proof that isomorphism preserves powers of a group, using induction

2 votes
6 answers
345 views

Finding constants in partial fraction

2 votes
1 answer
83 views

Find if an ordinary differential equation is linear

2 votes
3 answers
5k views

Equation of unit circle under linear transformation - can't understand role of inverse matrix

2 votes
1 answer
538 views

Connection between u-substitution change of limit and Riemann sum

2 votes
1 answer
79 views

Understanding lemma for proof of convexity

2 votes
2 answers
2k views

If two functions are increasing is their product increasing?

2 votes
1 answer
3k views

Relation between roots of function and roots of its derivative

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