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Pop Flamingo
  • Member for 10 years, 3 months
  • Last seen more than 1 year ago
28 votes
6 answers
16k views

Compute the $n$-th power of triangular $3\times3$ matrix

10 votes
3 answers
8k views

Is it possible to swap sums like that?

7 votes
2 answers
411 views

How can I prove that this sequence is monotonic?

5 votes
0 answers
186 views

Difference between a variable and an indeterminate [duplicate]

5 votes
2 answers
119 views

Proof of $\sqrt{a} + \sqrt{b} \le 2 \times \sqrt{a+b}$?

4 votes
3 answers
305 views

Prove that this is a rational number

3 votes
1 answer
211 views

How to prove this existence and uniqueness?

3 votes
3 answers
80 views

Do I justify it well?

2 votes
4 answers
70 views

What is the rule behind this derivative?

2 votes
2 answers
819 views

Angle between two vectors, where am I wrong?

2 votes
1 answer
3k views

Inner products and distributive property

2 votes
1 answer
43 views

How can I prove this inequality by using this one?

2 votes
1 answer
45 views

Is this proof redundant?

2 votes
2 answers
49 views

Can't understand parts of a question

1 vote
1 answer
45 views

Cant prove this inequality?

1 vote
1 answer
589 views

Function composition and bijection

1 vote
1 answer
55 views

How can I prove this inequality using this other one?

1 vote
2 answers
53 views

How to divide a complex number by another complex number?

1 vote
2 answers
69 views

How do you get from this to this formula?

1 vote
2 answers
126 views

How do I prove that this triangle is equilateral?

1 vote
2 answers
30 views

What is the result of these scalar products?

1 vote
2 answers
57 views

Why does this simplifies like that?

1 vote
1 answer
107 views

Modifying expression with exponent to another form

0 votes
2 answers
42 views

Where am I wrong with this derivative?

0 votes
2 answers
36 views

Is there an easy way to study the sign of this?

0 votes
2 answers
298 views

Does the square root function change the variations of a function?

0 votes
4 answers
30 views

How to get from there to there?

0 votes
2 answers
33 views

How to factorize this expression?

0 votes
2 answers
25 views

How to get to linear form?

0 votes
2 answers
56 views

How to justify this orthogonality?