Math Is Fun Forum

Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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Topic	Forum	Replies	Last post
1 The divisibility by 3 rule – direct proof by Ivar Sand	This is Cool	3	2026-09-15 02:01:17 by Ivar Sand
2 Equivalence and Equality are the same in Bool by Ivar Sand	This is Cool	0	2026-08-11 21:36:52 by Ivar Sand
3 Behind the scenes of proof by contradiction II by Ivar Sand	This is Cool	3	2025-08-26 23:02:38 by Jai Ganesh
4 Proof that the standard procedure for adding two numbers is correct by Ivar Sand	This is Cool	0	2023-09-10 23:11:44 by Ivar Sand
5 2 + 2 = 4 by Ivar Sand	This is Cool	1	2023-08-18 01:53:04 by Jai Ganesh
6 A proof of the residue theorem (complex analysis) by Ivar Sand	This is Cool	0	2013-05-15 21:23:27 by Ivar Sand
7 The divisibility by 3 rule – proof by induction by Ivar Sand	This is Cool	0	2013-04-14 20:41:34 by Ivar Sand
8 Exploring mathematicians and smart mathematicians by Ivar Sand	This is Cool	3	2013-03-25 00:43:53 by ShivamS
9 Behind the scenes of proof by contradiction by Ivar Sand	This is Cool	0	2013-03-03 21:40:40 by Ivar Sand
10 Topsy-turvy continuity by Ivar Sand	This is Cool	7	2013-02-03 23:26:59 by Ivar Sand
11 How to reduce the time checking if two lists contain the same elements by Ivar Sand	This is Cool	3	2013-01-23 21:22:13 by Ivar Sand

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