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Collector
Posts: 4838
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

Maxwell only used the word "nabla" one in his published writing and that was in a poem.

"Nabla was the name suggested to Tait by Robertson Smith because of the similarity of the symbol to an Assyrian harp."  Crowe in his book History of Vector Calculus

why did u guys not tell me this? So it is like playing harp, so then one need plenty of training to master it properly! I will practice harp the next six months!

Cuchulainn
Posts: 63816
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

### Re: Stupid question of the day

Nabla is just a name for Hamilion's differential operator
https://en.wikipedia.org/wiki/Nabla_symbol

The AI boys call it the Gradient.

Not to be confused with NAMBLA..
My C++ Boost code gives
262537412640768743.999999999999250072597198185688879353856337336990862707537410378210647910118607313

http://www.datasimfinancial.com
http://www.datasim.nl

Cuchulainn
Posts: 63816
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

### Re: Stupid question of the day

And when the function in question is vector-valued i.e. $f : \mathbb{R}^n \rightarrow \mathbb{R}^m$ the 'gradient becomes' the Jacobian matrix.
My C++ Boost code gives
262537412640768743.999999999999250072597198185688879353856337336990862707537410378210647910118607313

http://www.datasimfinancial.com
http://www.datasim.nl

Cuchulainn
Posts: 63816
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

### Re: Stupid question of the day

is it possible to be vaccinated with a phonograph needle?

www.youtube.com/watch?v=H3FZ_jtDMVg
My C++ Boost code gives
262537412640768743.999999999999250072597198185688879353856337336990862707537410378210647910118607313

http://www.datasimfinancial.com
http://www.datasim.nl

Paul
Posts: 11057
Joined: July 20th, 2001, 3:28 pm

### Re: Stupid question of the day

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?

Alan
Posts: 10497
Joined: December 19th, 2001, 4:01 am
Location: California
Contact:

### Re: Stupid question of the day

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?
Or this!

Collector
Posts: 4838
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?
Or this!
why invent what u have:
actually got hold of a old book where Newton portrait is drawn without his long fake hair...then u understand why he used fake hair!

katastrofa
Posts: 9853
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

Is cat poo a good soil fertaliser?

bearish
Posts: 6186
Joined: February 3rd, 2011, 2:19 pm

### Re: Stupid question of the day

Is cat poo a good soil fertaliser?

According to the internet it’s high in nitrogen, phosphorus and potassium, so sounds promising. Our friend C would of course be horticultural expert to consult.

katastrofa
Posts: 9853
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

If it's so nutritious why waste it on a fertaliser!

I have another question: why shops in Oslo put candles (like those one puts on the graves) on the pavement in front of the entrance? I initially thought it had something to do with All Saints Day... It looks creepy.

bearish
Posts: 6186
Joined: February 3rd, 2011, 2:19 pm

### Re: Stupid question of the day

If it's so nutritious why waste it on a fertaliser!

I have another question: why shops in Oslo put candles (like those one puts on the graves) on the pavement in front of the entrance? I initially thought it had something to do with All Saints Day... It looks creepy.

I’m not familiar with this phenomenon at all, and a brief attempt to search for it in Norwegian newspapers came up blank. So, you are either seeing things or you have spotted a new trend. Buy candle makers?

katastrofa
Posts: 9853
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

It's apparently another Christmas marketing tradition according to this website: https://anewbieinnorway.com/2015/02/16/ ... he-season/
They advertise like the opening hours lighting the candles at the doorstep.

It makes me think about graves and the dead

bearish
Posts: 6186
Joined: February 3rd, 2011, 2:19 pm

### Re: Stupid question of the day

Well, in a country where darkness rules for a third of the year, you should cut them some slack for coming up with excuses for lighting up. Even if it’s a wildly premature celebration of the solstice.

katastrofa
Posts: 9853
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

Yeah, totally nasty place. I wouldn't recommend Norway for living to anyone.

katastrofa
Posts: 9853
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

I invited home a Vegan Viking. We will be cooking! (He claims he can't cook, so I need to teach him everything - you know, slicing onion, etc.)
The question is where do I hide this from his sight? (Not Leela, her chicken.)
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