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fiftyeight
  • Member for 12 years, 2 months
  • Last seen more than 6 years ago
146 votes
15 answers
16k views

Are "if" and "iff" interchangeable in definitions?

20 votes
4 answers
12k views

Simple proof of integration in polar coordinates?

13 votes
1 answer
6k views

Proving determinant product rule combinatorially

10 votes
1 answer
1k views

Do Symmetric problems have Symmetric solutions?

9 votes
1 answer
4k views

proof of Zassenhaus formula for exponentials of linear operators

8 votes
2 answers
3k views

Is a finitely generated torsion group finite in general?

6 votes
2 answers
2k views

A unitary matrix taking a real matrix to another real matrix, is it an orthogonal matrix?

6 votes
2 answers
2k views

How is research done in universities?

5 votes
2 answers
4k views

Non-degenerate symmetric bilinear form; dimension formulae.

5 votes
4 answers
990 views

$0$-th exterior power, empty product of modules and their tensor product

2 votes
1 answer
139 views

Inverse function of $x + x^q$ with rational $q$

2 votes
6 answers
2k views

Intuitive Explanation of the graph $y = \sin x$ [duplicate]

2 votes
1 answer
415 views

dotting gradient in spherical coordinates with displacement vector

1 vote
1 answer
445 views

Gradient in curvilinear coordinates

1 vote
2 answers
168 views

Notation and terminology for functions, interpreting $f(y)$

1 vote
3 answers
377 views

Finding a curve that a function converges to

0 votes
1 answer
132 views

Notation for repeated application of operator

0 votes
0 answers
32 views

Term for an equation which is not a differential equation?