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

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#26 2016-04-19 09:57:33

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

Olinguito wrote:

I learn that it is possible to make a tetradecahedron with just regular hexagons and squares.

It is also possible to make a truncated icosahedron with regular pentagons and hexagons.

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#27 2017-06-18 08:35:05

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

Today I learned that Tabriz is a city in Iran, and that peridotite is an ultrabasic rock.


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#28 2017-07-23 05:35:53

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

Today I learn that types of ceramic pottery include earthenware, stoneware, and porcelain. These are fired at increasingly higher temperatures. Earthenware is porous and so is often glazed.

Also, Capella is the brightest star in the constellation Auriga.

Last edited by Nehushtan (2017-07-23 06:33:16)


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#29 2017-08-06 06:55:25

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

Today I learn that Tamil, Telugu, Malayalam and Kannada are Dravidian languages – even though they all use different writing scripts.

Last edited by Nehushtan (2017-08-06 06:55:39)


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#30 2017-08-11 22:53:02

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,996
Website

Re: What had you learned today that you found interesting?

I learnt that if an automaton with exactly n states accepts all strings of length n or less, then it accepts all strings.


'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

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#31 2017-08-12 01:06:29

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 2,000

Re: What had you learned today that you found interesting?

I learned that the online/offline status of LAN messenger depends on the monitor instead of the CPU.


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

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#32 2017-08-12 21:12:13

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

I have just learnt that the world's largest flower is the Rafflesia arnoldii, a parasitic plant that grows in the rainforests of Indonesia.


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#33 2017-08-13 01:48:10

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 2,000

Re: What had you learned today that you found interesting?

Yup, that's my country.

Today I learned that a nickel is a tenth of a dollar and a dime is a twentieth of a dollar.


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

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#34 2017-08-13 01:53:32

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,436
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Re: What had you learned today that you found interesting?

Monox D. I-Fly wrote:

a nickel is a tenth of a dollar and a dime is a twentieth of a dollar.

Are you sure?

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#35 2017-09-10 04:14:54

Nehushtan
Member
Registered: 2013-03-09
Posts: 957

Re: What had you learned today that you found interesting?

I learn that Sibi is a city in Pakistan, Sibiu is a city in Romania, and Sibu is a city in Malaysia.


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#36 2017-09-10 17:51:54

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 2,000

Re: What had you learned today that you found interesting?

zetafunc wrote:
Monox D. I-Fly wrote:

a nickel is a tenth of a dollar and a dime is a twentieth of a dollar.

Are you sure?

That's what Google said.


Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.

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#37 2018-10-10 11:42:10

Βεν Γ. Κυθισ
Member
Registered: 2018-10-09
Posts: 21

Re: What had you learned today that you found interesting?

I learnt that sine, cosine, and hyperbolic tangent all have attractive fixed points.

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#38 2018-10-10 15:36:08

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,375

Re: What had you learned today that you found interesting?

I learnt that there are 14 elements in the periodic table having single alphabet symbol in Chemistry. They are Hydrogen, Boron, Carbon, Nitrogen, Oxygen, Florine, Phosphorous, Sulfur, Potassium, Vanadium, Yttrium, Iodine, Tungsten, and Uranium.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#39 2018-11-14 14:53:18

zahlenspieler
Member
Registered: 2018-04-12
Posts: 7

Re: What had you learned today that you found interesting?

Hi, actually I learned that not today but some 35 years ago or so: The curve given by

is actually a hyperbola with foci

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#40 2018-11-21 01:04:46

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 48,375

Re: What had you learned today that you found interesting?

Hi,

I learnt long time back approximate value of 100! is 9.332622e+157, checked today for accuracy.


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#41 2019-03-25 23:11:14

iamaditya
Member
From: Planet Mars
Registered: 2016-11-15
Posts: 821

Re: What had you learned today that you found interesting?

bobbym wrote:

I have learned that if a = b and b = c then it follows that a = c.

Is that true, Bobbym?

Lol!
Rofl!


Practice makes a man perfect.
There is no substitute to hard work
All of us do not have equal talents but everybody has equal oppurtunities to build their talents.-APJ Abdul Kalam

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#42 2019-04-29 19:26:51

Alg Num Theory
Member
Registered: 2017-11-24
Posts: 693
Website

Re: What had you learned today that you found interesting?

I recently started learning about partial differential equations. The video gives the heat equation as an example of a PDE – and includes a fascinatingly watchable derivation of the equation discovered by Joseph Fourier.

Another example of a PDE is the wave equation:
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where ψ(x,t) is the function of a one-dimensional wave with position x at time t and c is the speed of propagation of the wave. If the wave has amplitude A, frequency f and wavelength λ, then c = and the wave function has a complex solution given by
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where ω = 2πf is the angular frequency and k =  2π/λ is the wavenumber. Note that:
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– that is to say, the motion of each point of the wave is simple harmonic.


Me, or the ugly man, whatever (3,3,6)

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#43 2019-07-02 07:41:37

Jaspers
Member
Registered: 2019-05-24
Posts: 54

Re: What had you learned today that you found interesting?

Today I learned the word thigmomorphogenesis, which is the way plants grow in response to touch.


Reason is like an open secret that can become known to anyone at any time; it is the quiet space into which everyone can enter through his own thought.

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