Forum: chalsall
2022-06-02, 20:51
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Replies: 46
Views: 3,120
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Forum: Lounge
2022-06-02, 20:45
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Replies: 15
Views: 588
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Forum: Lounge
2022-05-31, 08:04
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Replies: 15
Views: 588
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Forum: Lounge
2022-05-31, 08:03
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Replies: 15
Views: 588
Knots, theory and practice
The mathematical theory of knots is fun.
So are many practical applications: sailing, climbing, surgery, ...
Welcome to the knot thread!
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Forum: Languages -- Ancient & Modern, Human & Machine
2022-02-21, 09:31
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Replies: 69
Views: 31,895
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Forum: Lounge
2021-12-07, 08:40
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Replies: 1,936
Views: 227,241
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Forum: Miscellaneous Math
2021-12-07, 08:24
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Replies: 52
Views: 4,533
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Forum: Miscellaneous Math
2021-12-06, 23:05
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Replies: 52
Views: 4,533
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Forum: Homework Help
2021-11-20, 11:42
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Replies: 29
Views: 8,649
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Forum: Math
2021-11-16, 09:17
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Replies: 60
Views: 8,432
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Forum: Languages -- Ancient & Modern, Human & Machine
2021-11-09, 14:21
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Replies: 26
Views: 14,479
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Forum: Lounge
2021-11-08, 21:22
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Replies: 42
Views: 3,630
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Forum: Probability & Probabilistic Number Theory
2021-11-04, 23:11
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Replies: 18
Views: 8,468
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Forum: Astronomy
2021-10-31, 18:27
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Replies: 18
Views: 2,144
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Forum: Puzzles
2021-10-29, 21:06
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Replies: 4
Views: 1,318
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Forum: Languages -- Ancient & Modern, Human & Machine
2021-10-24, 08:05
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Replies: 26
Views: 14,479
Certainly an interesting link!
If you have...
Certainly an interesting link!
If you have university access to online journals, the Daniel Levin article is also worth reading:
https://www.jstor.org/stable/10.5325/steinbeckreview.12.2.0190
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Forum: Number Theory Discussion Group
2021-10-24, 07:45
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Replies: 4
Views: 1,886
Over any commutative ring R, the 2x2 matrices...
Over any commutative ring R, the 2x2 matrices with determinant 1 form a subgroup \(SL_2(R)\)
of the unit group of the ring of all 2x2 matrices.
The Pauli matrices have determinant -1, however.
...
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Forum: Software
2021-10-23, 07:25
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Replies: 32
Views: 3,529
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Forum: Lounge
2021-10-22, 11:20
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Replies: 42
Views: 3,630
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Forum: Lounge
2021-10-22, 07:33
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Replies: 1,936
Views: 227,241
Bernard Haitink...
Bernard Haitink (https://www.bbc.com/news/entertainment-arts-59002746),the world-famous Dutch conductor.
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Forum: Lounge
2021-10-21, 16:34
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Replies: 4,467
Views: 423,391
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Forum: Science & Technology
2021-10-20, 08:41
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Replies: 522
Views: 102,815
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Forum: Miscellaneous Math
2021-10-18, 14:23
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Replies: 26
Views: 2,328
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Forum: Miscellaneous Math
2021-10-18, 13:53
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Replies: 26
Views: 2,328
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Forum: MattcAnderson
2021-10-18, 09:55
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Replies: 24
Views: 2,178
The mathematical background is that you can...
The mathematical background is that you can construct the regular polygon with n sides using ruler and compass
if and only if ϕ(n) is a power of 2 (where ϕ is Euler's function).
And that is true...
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