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Lucenaposition
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  • Australia
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Hi. I like maths and chess and Python programming. I am interested in whether certain statements provable in ZFC are provable in ZF.

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question
11
If $|A| \le |B| \le |C|$ and $A \subseteq C$ does there exist $D$ with $A \subseteq D \subseteq C$ and $|B| = |D|$?
Aug 27
answer
8
Is sudoku only one puzzle?
Aug 20
question
7
Inequality of cardinal sums [duplicate]
Jul 9
answer
7
Construct a non-abelian group $G$ such that $g^3=1$ for all $g\in G$, where 1 is the identity.
Aug 6
question
6
Does this equality imply choice?
Jul 30
question
6
Least beth number $\ge$ an aleph number
Aug 3
answer
6
Grid filled with +1 or -1 is adjusted such that each cell is the product of its adjacent squares
Aug 14, 2023
answer
6
Find a function $f$ which is discontinuous at $1,\frac{1}{2},\frac{1}{3},\frac{1}{4},...$ but continuous at all other points
Aug 7
answer
5
What is the value of $\lfloor \int_{0}^{2023}\frac{2}{x+e^x}dx \rfloor$?
Jul 23
answer
5
$A^2 + I = 0$ show that the degree of $A$ is even
May 23
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20
Dividing shape into 2 congruent pieces
16
Zugzwang where the side to move must be mated in exactly 2 moves
15
Make both colors connected
14
Calculate the sum of numbers in a rectangle
13
A hat puzzle question—how to prove the standard solution is optimal?