SERVING THE QUANTITATIVE FINANCE COMMUNITY

 
User avatar
Collector
Posts: 4831
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

October 28th, 2020, 8:10 pm

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!
Screen Shot 2020-10-28 at 9.31.55 PM.png
 
User avatar
Cuchulainn
Posts: 63413
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: Stupid question of the day

October 28th, 2020, 8:44 pm

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
 
User avatar
Cuchulainn
Posts: 63413
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: Stupid question of the day

October 30th, 2020, 9:29 am

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
 
User avatar
Cuchulainn
Posts: 63413
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: Stupid question of the day

November 13th, 2020, 5:05 pm

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
 
User avatar
Paul
Posts: 10922
Joined: July 20th, 2001, 3:28 pm

Re: Stupid question of the day

November 13th, 2020, 7:31 pm

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?
 
User avatar
Alan
Posts: 10474
Joined: December 19th, 2001, 4:01 am
Location: California
Contact:

Re: Stupid question of the day

November 13th, 2020, 9:21 pm

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?
Or this!
 
User avatar
Collector
Posts: 4831
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

November 13th, 2020, 11:56 pm

If Isaac Newton knew so much about momentum why didn't he invent the bicycle?
Or this!
why invent what u have:
Screen Shot 2020-11-14 at 12.54.11 AM.png
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!
 
User avatar
katastrofa
Posts: 9724
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

November 14th, 2020, 7:42 pm

Is cat poo a good soil fertaliser?
 
User avatar
bearish
Posts: 6008
Joined: February 3rd, 2011, 2:19 pm

Re: Stupid question of the day

November 14th, 2020, 11:43 pm

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.
 
User avatar
katastrofa
Posts: 9724
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

November 15th, 2020, 12:41 pm

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.
 
User avatar
bearish
Posts: 6008
Joined: February 3rd, 2011, 2:19 pm

Re: Stupid question of the day

November 15th, 2020, 6:54 pm

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?
 
User avatar
katastrofa
Posts: 9724
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

November 15th, 2020, 8:41 pm

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 :-(
 
User avatar
bearish
Posts: 6008
Joined: February 3rd, 2011, 2:19 pm

Re: Stupid question of the day

November 15th, 2020, 9:26 pm

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.
 
User avatar
katastrofa
Posts: 9724
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

November 16th, 2020, 12:52 am

Yeah, totally nasty place. I wouldn't recommend Norway for living to anyone.
 
User avatar
katastrofa
Posts: 9724
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

November 22nd, 2020, 10:37 am

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.)
Attachments
B9031E0D-032C-44BE-BD8E-13849DF5E6B8.jpeg
ABOUT WILMOTT

PW by JB

Wilmott.com has been "Serving the Quantitative Finance Community" since 2001. Continued...


Twitter LinkedIn Instagram

JOBS BOARD

JOBS BOARD

Looking for a quant job, risk, algo trading,...? Browse jobs here...


GZIP: On