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wvxvw
  • Member for 12 years, 1 month
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6 votes
3 answers
7k views

Can product of two singular matrices be invertible?

5 votes
2 answers
266 views

Is it sufficient to say that no odd divides an even number to prove it is a power of two?

5 votes
2 answers
561 views

Is it possible to be "too good" at Spider Solitaire?

4 votes
2 answers
1k views

How to show $\sum_{n=0}^m \frac{1}{n+1}\binom{m}{n} = \frac{2^m-1}{m+1}$

4 votes
0 answers
348 views

Questions about decimal expansion being able to represent all real numbers

4 votes
1 answer
2k views

When should I use "let" "put" "be" in a proof?

4 votes
1 answer
2k views

What are numbers? [duplicate]

3 votes
1 answer
460 views

What is isobaric function?

3 votes
2 answers
276 views

Is it possible that there isn't a linear span which precisely spans a vector space?

3 votes
1 answer
497 views

Is there no Pareto-optimal Shotgun game?

3 votes
2 answers
992 views

Does cancellation property imply invertibility? [duplicate]

2 votes
3 answers
966 views

What ring-sum of vector spaces can possibly mean?

2 votes
2 answers
877 views

15Puzzle, sum of inversions - what's been summed?

2 votes
1 answer
626 views

Find number of solutions of this equation using generating function

2 votes
2 answers
532 views

What happens to dimension of kernel when squaring non-invertible matrix?

1 vote
2 answers
690 views

Will identity matrix necessarily appear in powers of any permutation matrix?

1 vote
1 answer
809 views

Finding number of summands by using generating function

1 vote
0 answers
23 views

Find all assignments to $a$ which make a set of equations defined on other set of equations linearly dependant

1 vote
0 answers
79 views

Translate group definition into geometry system

1 vote
1 answer
1k views

Adjacent transposition - explain in layman terms

1 vote
0 answers
88 views

Proof that the sum of the limits is the limit of the sum not subtracting infinity

1 vote
2 answers
1k views

Is transitive closure defined uniquely?

1 vote
1 answer
714 views

General technique of proving limit exists as x approaches infinity

1 vote
0 answers
156 views

Are little-o and "error term" the same thing?

1 vote
1 answer
493 views

When are monic polynomials of fourth degree divisible?

1 vote
3 answers
1k views

If a function is defined on the interval $(a, b)$, is the derivative necessarily defined at $a$ and $b$?

1 vote
5 answers
472 views

Is sine of one degree a real? If not, how is sine continuous?

1 vote
1 answer
67 views

Why quarters of potatoes fall the way they do?

1 vote
1 answer
36 views

What does discriminant of polinomial discriminate?

1 vote
1 answer
302 views

Will sums of infinitely many primes ever fail to generate almost all natural numbers?