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

You are not logged in.

- Topics: Active | Unanswered

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

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.

**238** books currently added on

Offline

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

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

**238** books currently added on

Offline

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

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)*

**238** books currently added on

Offline

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

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)*

**238** books currently added on

Offline

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.

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,681

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 who has passed away. May his adventurous soul rest in peace at heaven.

Offline

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

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

**238** books currently added on

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,681

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 who has passed away. May his adventurous soul rest in peace at heaven.

Offline

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

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

**238** books currently added on

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,681

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 who has passed away. May his adventurous soul rest in peace at heaven.

Offline

**Βεν Γ. Κυθισ****Member**- Registered: 2018-10-09
- Posts: 20

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

1+1=|e^(π×i)-1|

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,479

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 is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

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

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

is actually a hyperbola with fociOffline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,479

Hi,

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

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

**iamaditya****Member**- From: Planet Mars
- Registered: 2016-11-15
- Posts: 820

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

Offline

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

I recently started learning about . 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:

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* = *fλ* and the wave function has a complex solution given by

where *ω* = 2*πf* is the angular frequency and *k* = 2*π*/*λ* is the wavenumber. Note that:

– that is to say, the motion of each point of the wave is simple harmonic.

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

Offline

**Jaspers****Member**- Registered: 2019-05-24
- Posts: 52

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.

Offline