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# Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

2. ### Challenge problem #5 [Olinguito]

• Replies: 1
• Views: 65
Yesterday, 04:45
3. ### Tricky Question (for which I do not know the answer)

• Replies: 0
• Views: 81
June 14th, 2018, 13:40
4. ### Thumbtacks

• Replies: 1
• Views: 113
June 8th, 2018, 07:47
5. ### Propositional calculus

• Replies: 10
• Views: 406
May 28th, 2018, 20:02
6. ### Unsolved Challenge Simple closed form for integral

• Replies: 2
• Views: 287
May 20th, 2018, 22:52
7. ### Mutually commuting linearly independent complex matrices

• Replies: 2
• Views: 223
May 20th, 2018, 22:50
8. ### A Hankel Determinant Limit

• Replies: 2
• Views: 257
May 18th, 2018, 18:48
9. ### Challenge problem #4 [Olinguito]

• Replies: 2
• Views: 243
May 15th, 2018, 12:11
10. ### Challenge problem #3 [Olinguito]

• Replies: 4
• Views: 300
May 13th, 2018, 20:04
11. ### axiomatics

• Replies: 16
• Views: 629
May 9th, 2018, 13:35
12. ### set theory

• Replies: 3
• Views: 223
May 8th, 2018, 16:10
13. ### Circumcircles

• Replies: 2
• Views: 248
May 7th, 2018, 19:13
14. ### Challenge problem #2 [Olinguito]

• Replies: 3
• Views: 145
May 1st, 2018, 19:50
15. ### Loan @ 3 rates

• Replies: 8
• Views: 177
April 30th, 2018, 19:38
16. ### Tanh Integral

• Replies: 1
• Views: 98
April 24th, 2018, 13:16
17. ### Unsolved Challenge Integral of tan, ln

• Replies: 0
• Views: 76
April 24th, 2018, 02:21
18. ### Unsolved Challenge An interesting Integral

• Replies: 0
• Views: 74
April 24th, 2018, 02:05
19. ### Unsolved Challenge Five, Phi and Pi in one integral

• Replies: 3
• Views: 170
April 23rd, 2018, 17:52
20. ### Unsolved Challenge Long Integral

• Replies: 0
• Views: 58
April 23rd, 2018, 03:24
21. ### Unsolved Challenge Integral of sine

• Replies: 3
• Views: 104
April 23rd, 2018, 00:54
22. ### Unsolved Challenge Integral of product

• Replies: 0
• Views: 62
April 22nd, 2018, 17:59
23. ### Challenge problem #1 [Olinguito]

• Replies: 4
• Views: 99
April 22nd, 2018, 07:43
24. ### Unsolved Challenge imaginary integral

• Replies: 1
• Views: 83
April 22nd, 2018, 04:19
25. ### Unsolved Challenge Ahmad's Cousin - arctan integral

• Replies: 0
• Views: 84
April 21st, 2018, 16:17
26. ### Unsolved Challenge A tough Integral

• Replies: 6
• Views: 244
April 20th, 2018, 16:22
27. ### Unsolved Challenge Quite complicated integral

• Replies: 0
• Views: 74
April 20th, 2018, 15:55
28. ### Unsolved Challenge Curious Integral

• Replies: 0
• Views: 73
April 19th, 2018, 05:27
29. ### Fish pond challenge

• Replies: 3
• Views: 181
April 14th, 2018, 15:05
30. ### Maximum Displacement in Projectile Motion

• Replies: 2
• Views: 84
April 14th, 2018, 13:25
31. ### Unsolved Challenge A hard integral gives a simple closed form

• Replies: 1
• Views: 111
GJA
April 10th, 2018, 23:28

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