Frank Vel's user avatar
Frank Vel's user avatar
Frank Vel's user avatar
Frank Vel
  • Member for 9 years, 6 months
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159 votes
25 answers
19k views

Most ambiguous and inconsistent phrases and notations in maths

57 votes
2 answers
10k views

Why aren't integration and differentiation inverses of each other?

39 votes
6 answers
5k views

Is there a commutative operation for which the inverse of the operation is also commutative?

28 votes
1 answer
5k views

What comes after length, area and volume? [duplicate]

22 votes
3 answers
7k views

Symbol for unknown relation?

20 votes
13 answers
6k views

What are examples of vectors that are not usually called vectors?

16 votes
9 answers
621 views

Lesser known derivations of well-known formulas and theorems

15 votes
5 answers
646 views

What is the difference between $\frac{\mathrm{d}}{\mathrm{d}x}$ and $\frac{\partial}{\partial x}$?

13 votes
6 answers
6k views

Is there a difference between $y(x)$ and $f(x)$

12 votes
5 answers
1k views

Urn with an infinite number of balls of finite, uniformly distributed colours [duplicate]

12 votes
5 answers
921 views

How is implicit differentiation formally defined?

9 votes
5 answers
1k views

Is $f(x,y) = f(\mathbf{x})$ abuse of notation?

6 votes
1 answer
182 views

Show that the limit $\lim_{(x,y)\to(0,0)}\frac{y+\sin3x-3x}{y+x^5}$ exist/does not exist.

6 votes
2 answers
595 views

Generalisations of primes

5 votes
5 answers
315 views

Is there a symbol for integrating and setting $C=0$?

5 votes
2 answers
3k views

Differences and relations between $\partial x, dx, \delta x, \Delta x$.

5 votes
1 answer
119 views

Kirchhoffs laws as described by homology

5 votes
1 answer
3k views

Probability that the sum of $k$ dice is $n$

4 votes
2 answers
6k views

Continuing "Pascal's triangle" for negative binomial exponents

4 votes
4 answers
172 views

Understanding the $\mathrm{d}x$ in integrals

4 votes
2 answers
320 views

Why do we write $a^n$ instead of $^n\!a$ for exponentiation?

4 votes
3 answers
3k views

Subsets of $\{1,2,3,4,5,6,7,8\}$ with at least 1 odd and 1 even number

4 votes
4 answers
201 views

Question about $x\mapsto f(x)$ notation.

3 votes
8 answers
275 views

How can expressions like $x^2+y^2 = 4$ be defined?

3 votes
3 answers
8k views

Expected value of $g(X)$.

3 votes
1 answer
414 views

Is this notation for inverse functions bad?

3 votes
3 answers
189 views

What is the element produced under a generic binary operation called?

3 votes
1 answer
2k views

When is Leibniz' notation for derivatives useful?

3 votes
1 answer
1k views

Operator norm in terms of matrix norm

3 votes
2 answers
29k views

Expected value of a lognormal distribution [duplicate]

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