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Mathematics
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PinkRabbit
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Undergraduate student at IIIS, THU.

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8
Can $10$..$09$ be a perfect square?
Mar 29, 2023
8
Number of sequences that satisfy the absolute difference condition
Sep 4, 2023
7
Moduli $m \ge 2$ such that $\{ a^a \bmod m : 1 \le a \le m \text{ and } \gcd(a, m) = 1 \}$ forms a reduced residue system
Mar 12
6
Finite Commutative ring with 100 elements where $x^2=x$?
Jul 2
4
Question on convergence of infinite product
Mar 22, 2023
4
Proving that a symmetric tridiagonal matrix is positive definite
Apr 9, 2023
4
In how many ways can four distinctive letters be posted in 6 post boxes such that any two go in same post box and remaining go to different boxes?
Sep 3, 2023
4
$n$- transposition permutations in $S_{2n}$ which decompose a $2n$-cycle into $n+1$ cycles
Sep 3, 2023
3
Let $A$ be a square matrix such that $A(I-A)=I$, prove $A^2-I$ is invertible
Mar 22, 2023
2
Product of differences of roots of unity
Apr 1, 2023