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Mathematics
Fred Jefferson's user avatar
Fred Jefferson's user avatar
Fred Jefferson's user avatar
Fred Jefferson
  • Member for 3 years, 11 months
  • Last seen more than a month ago
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9
Prove that $\int_1^2 g(x^3 - 3x)\,\mathrm dx=\int_0^1 g(x^3 - 3x)\,\mathrm dx$
Nov 2, 2021
6
Find the number of subsets $\{a_1,\cdots, a_k\}$ of $\{1,\cdots, p\}$ so that $a_1+a_2+\cdots + a_k\equiv 0\mod p.$
Nov 5, 2022
6
solve in positive integers the equation $2x^2+x = y+3y^2.$
Oct 31, 2022
6
existence of $99$ lines in $\mathbb{R}^2$ passing through $100^2$ boxes
Feb 20, 2022
6
Find all $\mathbb{Q}$-linear maps $\phi : \mathbb{Q}[x]\to\mathbb{Q}[x]$ that send irreducible polynomials to irreducible polynomials
Oct 9, 2022
6
Sequence of $0$’s and $1$’s without six consecutive identical blocks
Jul 2, 2022
5
proof of a bounded sequence satisfying a certain property
Feb 10, 2022
5
find the number of maximal three-square-free subsets of $S$
Aug 17, 2022
5
subset of a basis of a separable metric space
Jun 12, 2021
5
determine whether it is possible that $a_n$ is composite only finitely many times
Jul 24, 2022