Skip to main content
ghshtalt's user avatar
ghshtalt's user avatar
ghshtalt's user avatar
ghshtalt
  • Member for 13 years, 8 months
  • Last seen more than 9 years ago
29 votes
8 answers
11k views

Fibonacci addition law $F_{n+m} = F_{n-1}F_m + F_n F_{m+1}$

29 votes
8 answers
75k views

Show that a continuous function has a fixed point

25 votes
1 answer
33k views

How are norms different from absolute values?

20 votes
4 answers
5k views

Why is the 'change-of-basis matrix' called such?

15 votes
2 answers
28k views

Show that the set of all symmetric, real matrices is a subspace, determine the dimension

14 votes
2 answers
26k views

Determine the matrix relative to a given basis

10 votes
1 answer
738 views

What is the difference between finding a basis for a complex and a real space?

7 votes
3 answers
1k views

What are the explanations for certain steps in these proofs for the irrationality/rationality of certain numbers?

7 votes
3 answers
4k views

Show that $V = \mbox{ker}(f) \oplus \mbox{im}(f)$ for a linear map with $f \circ f = f$

6 votes
3 answers
360 views

Proving or disproving statements related to convergent and absolutely convergent series

6 votes
2 answers
1k views

What is the explanation for the elements of this set?

6 votes
1 answer
3k views

Who was the mathematician who thought "god" was out to get him?

5 votes
2 answers
1k views

Understanding this partial derivative problem

5 votes
6 answers
11k views

Proving $(2n+1) + (2n+3) + \cdots + (4n-1) = 3n^{2}$ for all positive integers $n$

5 votes
2 answers
677 views

Calculate the rank of the following matrices

5 votes
1 answer
853 views

Determine sign of a permutation, calculate number of elements in the subgroup of permutations with sign = 1

5 votes
1 answer
3k views

Showing properties of discontinuous points of a strictly increasing function [duplicate]

4 votes
1 answer
240 views

Why is this tuple of vectors not a basis for $\mathbb{R}^{2}$?

4 votes
2 answers
2k views

Step functions and the characteristic function of rationals

4 votes
1 answer
5k views

How to calculate complex roots of a polynomial

4 votes
3 answers
478 views

Why does $a_n = (1+\frac{2}{n})^{n}$ converge to $e^2$?

4 votes
2 answers
3k views

Subtraction and division with integers modulo 3

4 votes
2 answers
256 views

How to show certain things related to scalar products

3 votes
2 answers
325 views

What is the best way to show that no positive powers of this matrix will be the identity matrix?

3 votes
1 answer
332 views

Are bounded sequences always strictly less than some fixed number $M$?

3 votes
2 answers
529 views

Why exactly can you take the absolute value of one side of this inequality and assume it is still true?

3 votes
3 answers
11k views

Is Thomae's function Riemann integrable?

3 votes
1 answer
399 views

How do you convert this diagram into a linear system of equations/matrix form?

2 votes
1 answer
2k views

Show that this is a vector space and determine the dimension

2 votes
1 answer
607 views

Proving statements related to open sets