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# Math Challenge Problems Forum

Math Challenge Problem Forum: For challenging math problems (that you can solve yourself)

• Replies: 0
• Views: 686
Apr 15th 2014, 05:32 PM
1. ### How to show int (sinx /x) dx (x-0..infinity) is convergent

• Replies: 9
• Views: 13,310
Sep 29th 2012, 06:50 PM
2. ### proof of De Morgan laws

• Replies: 5
• Views: 11,568
Jun 20th 2010, 06:02 AM
3. ### Trick Questions

• Replies: 85
• Views: 11,223
Nov 19th 2006, 05:18 AM
4. ### Problem 50

• Replies: 18
• Views: 10,647
Aug 7th 2009, 04:45 PM
5. ### MHF Integral Bee!

• Replies: 103
• Views: 7,353
Aug 24th 2009, 05:28 AM
6. ### Prove some identities!

• Replies: 105
• Views: 6,839
Dec 29th 2010, 11:58 PM
7. ### 2011 MIT Integration Bee Qualifying Test

• Replies: 38
• Views: 6,728
Feb 1st 2011, 02:59 AM
8. ### 5 pirates sharing the booty

• Replies: 25
• Views: 6,657
Sep 12th 2007, 09:00 PM
9. ### Prove some identities! (Round two)

• Replies: 93
• Views: 6,205
Feb 7th 2011, 04:50 AM
10. ### Jacobi identity

• Replies: 11
• Views: 5,760
Oct 8th 2009, 01:20 AM
11. ### Problem 48

• Replies: 15
• Views: 5,313
Oct 12th 2008, 01:51 PM
12. ### Problem 40

• Replies: 30
• Views: 4,680
Nov 18th 2007, 06:45 PM
13. ### The Locker Problem

• Replies: 3
• Views: 4,565
Feb 15th 2007, 08:06 PM
14. ### Walk 1 mi South, 1 mi West, 1 mi North, end up where you started

• Replies: 6
• Views: 4,293
Jan 11th 2009, 11:33 AM
15. ### Need help on POW 12: The Big Knight Switch

• Replies: 2
• Views: 4,103
Jun 5th 2005, 05:35 PM
16. ### card 'trick' and group theory

• Replies: 17
• Views: 3,857
Dec 23rd 2006, 09:21 AM
17. ### Power series for tangent function

• Replies: 1
• Views: 3,721
Oct 24th 2009, 06:41 AM
18. ### Proof that 1 = 2

• Replies: 29
• Views: 3,556
Jul 20th 2013, 03:59 PM
19. ### 4x4 Grid Puzzle

• Replies: 7
• Views: 3,426
Jun 17th 2008, 01:46 PM
20. ### Permutations

• Replies: 10
• Views: 3,411
Jan 1st 2013, 12:39 PM
21. ### Solution behind a card trick?

• Replies: 4
• Views: 3,287
Apr 16th 2008, 09:53 PM
22. ### Problem 44

• Replies: 17
• Views: 3,254
Feb 10th 2008, 08:04 PM
23. ### Problem 47

• Replies: 8
• Views: 3,100
Jan 31st 2009, 02:40 PM
24. ### How many rectangles in a 10 x 10 checkerboard?

• Replies: 3
• Views: 3,092
Nov 12th 2005, 12:57 AM

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