List of problems¶

Math problems I'm too lazy to write down in $\LaTeX$, along with their solutions.

• Daily mechanics problem of 22/04/2026.
• Daily integral of 14/04/2026: Medium difficulty.
• Daily integral of 13/04/2026: Medium difficulty.
• Sum of orthogonal matrices with opposite determinants is singular.
• CEMC Problem of the Week 25E, 2025/26.
• RSME Problem of the Month Jv-028, Nov. 2022.
• RSME Problem of the Month S-017, Nov. 2021.
• CEMC Problem of the Week 24E, 2025/26.
• RSME Problem of the Month Jn-013, Jun. 2021.
• Normal, square, upper-triangular matrices are diagonal.
• Fibonacci numbers in $\mathscr O(\log n)$.
• No nontrivial automorphism implies abelianity and elements of order 2.
• 100-door divisibility problem.
• CEMC Problem of the Week 23E, 2025/26.