Niklas Rosencrantz's user avatar
Niklas Rosencrantz's user avatar
Niklas Rosencrantz's user avatar
Niklas Rosencrantz
  • Member for 11 years, 8 months
  • Last seen more than a month ago
37 votes
8 answers
62k views

Is the empty set a subset of itself?

33 votes
4 answers
27k views

What is the difference between ⊢ and ⊨?

26 votes
4 answers
2k views

Can a 2D person walking on a Möbius strip prove that it's on a Möbius strip?

21 votes
5 answers
3k views

Is a proof also "evidence"?

13 votes
2 answers
384 views

Is there a good way to solve for z the equation $e^{i\pi} = e^{z\ln2} + e^{z\ln3}$?

10 votes
6 answers
11k views

Is there a simple example of how the law of the excluded middle can be inapplicable?

5 votes
2 answers
833 views

Why doesn't logic, math, physics etc have a symbol for "example"?

5 votes
1 answer
10k views

Any functionally complete sets with XOR?

5 votes
1 answer
3k views

Why does relative error give number of correct digits?

5 votes
1 answer
202 views

What is the difficulty when calculating this integral?

5 votes
1 answer
8k views

What is the convergence order and asymptotic error constant for these results?

5 votes
4 answers
8k views

Is A∨¬A a tautology when there is a proof (by contradiction)?

4 votes
1 answer
1k views

What is the hat number problem?

4 votes
1 answer
105 views

Is this expression true and legal?

4 votes
6 answers
3k views

Understand closure and limit points

3 votes
3 answers
76 views

Double the value of a quadratic expression

3 votes
1 answer
328 views

What is the difference between $Γ⊭Φ$ and $Γ⊭¬Φ$?

3 votes
1 answer
710 views

How to proceed solving this problem?

3 votes
1 answer
234 views

What is the probability for a monkey writing Shakespeare? [duplicate]

3 votes
3 answers
665 views

Impossibility theorems

3 votes
1 answer
328 views

Are $e$ and $\pi$ dependent since $f(e)=\pi$ and$ f(\pi)=e$?

2 votes
1 answer
224 views

Base-rate fallacy?

2 votes
1 answer
169 views

Can you express a logic system like S5 using only a Gödel number?

2 votes
2 answers
3k views

What are the drawbacks of multiple-choice questions? [closed]

2 votes
2 answers
120 views

Is it true that $((A\rightarrow B)\land(¬A\rightarrow ¬B))↔((¬A) \;\;\text{⊕}\;\; B)$? [closed]

2 votes
1 answer
114 views

Can we define what is an algebra and what is another?

2 votes
1 answer
39k views

Solving a system with Newton's method in matlab?

2 votes
2 answers
144 views

What happens when a probability actually occurs?

2 votes
1 answer
258 views

Is there a book called "mathematical pranks"?

2 votes
1 answer
54 views

Is there a formula for general induction?