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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. ### Propositional calculus

• Replies: 9
• Views: 190
May 20th, 2018, 23:58
3. ### Unsolved Challenge Simple closed form for integral

• Replies: 2
• Views: 186
May 20th, 2018, 22:52
4. ### Mutually commuting linearly independent complex matrices

• Replies: 2
• Views: 119
May 20th, 2018, 22:50
5. ### A Hankel Determinant Limit

• Replies: 2
• Views: 144
May 18th, 2018, 18:48
6. ### Challenge problem #4 [Olinguito]

• Replies: 2
• Views: 148
May 15th, 2018, 12:11
7. ### Challenge problem #3 [Olinguito]

• Replies: 4
• Views: 208
May 13th, 2018, 20:04
8. ### axiomatics

• Replies: 16
• Views: 436
May 9th, 2018, 13:35
9. ### set theory

• Replies: 3
• Views: 142
May 8th, 2018, 16:10
10. ### Circumcircles

• Replies: 2
• Views: 152
May 7th, 2018, 19:13
11. ### Challenge problem #2 [Olinguito]

• Replies: 3
• Views: 134
May 1st, 2018, 19:50
12. ### Loan @ 3 rates

• Replies: 8
• Views: 163
April 30th, 2018, 19:38
13. ### Tanh Integral

• Replies: 1
• Views: 87
April 24th, 2018, 13:16
14. ### Unsolved Challenge Integral of tan, ln

• Replies: 0
• Views: 68
April 24th, 2018, 02:21
15. ### Unsolved Challenge An interesting Integral

• Replies: 0
• Views: 67
April 24th, 2018, 02:05
16. ### Unsolved Challenge Five, Phi and Pi in one integral

• Replies: 3
• Views: 158
April 23rd, 2018, 17:52
17. ### Unsolved Challenge Long Integral

• Replies: 0
• Views: 51
April 23rd, 2018, 03:24
18. ### Unsolved Challenge Integral of sine

• Replies: 3
• Views: 92
April 23rd, 2018, 00:54
19. ### Unsolved Challenge Integral of product

• Replies: 0
• Views: 55
April 22nd, 2018, 17:59
20. ### Challenge problem #1 [Olinguito]

• Replies: 4
• Views: 89
April 22nd, 2018, 07:43
21. ### Unsolved Challenge imaginary integral

• Replies: 1
• Views: 74
April 22nd, 2018, 04:19
22. ### Unsolved Challenge Ahmad's Cousin - arctan integral

• Replies: 0
• Views: 76
April 21st, 2018, 16:17
23. ### Unsolved Challenge A tough Integral

• Replies: 6
• Views: 217
April 20th, 2018, 16:22
24. ### Unsolved Challenge Quite complicated integral

• Replies: 0
• Views: 66
April 20th, 2018, 15:55
25. ### Unsolved Challenge Curious Integral

• Replies: 0
• Views: 65
April 19th, 2018, 05:27
26. ### Fish pond challenge

• Replies: 3
• Views: 174
April 14th, 2018, 15:05
27. ### Maximum Displacement in Projectile Motion

• Replies: 2
• Views: 74
April 14th, 2018, 13:25
28. ### Unsolved Challenge A hard integral gives a simple closed form

• Replies: 1
• Views: 102
GJA
April 10th, 2018, 23:28
29. ### Unsolved Challenge Oloa Olivier's type integral

• Replies: 0
• Views: 99
April 9th, 2018, 06:05
30. ### Trigonometric product challenge

• Replies: 2
• Views: 119
April 5th, 2018, 17:45

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