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Cuchulainn
Posts: 61589
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

I often explain vega via

$\frac{\partial \, \mbox{Area of a circle}}{\partial \pi}=r^2$
$\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial x}=ab$

this because a circle moved along the x axis is observed to be an ellipse due to length contraction, so we have the well unknown circle equation

$\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial t}-\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial x}=r^2-ab$

or more interesting

$\frac{\partial \, \mbox{Area of a circle}}{\partial t}-\frac{\partial \, \mbox{Area of a circle}}{ \partial x}=\pi r^2-\pi ab$

where a and b functions of v

and do we also get:?

$\frac{\partial \, \mbox{Area of a circle}}{\partial t}-\nabla \mbox{Area of a circle} =\pi r^2-\pi ab$

more complex under acceleration.
Ah, mixed derivatives!
Would they be called "mixed Greeks"?
http://www.datasimfinancial.com
http://www.datasim.nl

Every Time We Teach a Child Something, We Keep Him from Inventing It Himself
Jean Piaget

Collector
Posts: 4575
Joined: August 21st, 2001, 12:37 pm

I often explain vega via

$\frac{\partial \, \mbox{Area of a circle}}{\partial \pi}=r^2$
$\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial x}=ab$

this because a circle moved along the x axis is observed to be an ellipse due to length contraction, so we have the well unknown circle equation

$\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial t}-\frac{\partial^2 \, \mbox{Area of a circle}}{\partial \pi \partial x}=r^2-ab$

or more interesting

$\frac{\partial \, \mbox{Area of a circle}}{\partial t}-\frac{\partial \, \mbox{Area of a circle}}{ \partial x}=\pi r^2-\pi ab$

where a and b functions of v

and do we also get:?

$\frac{\partial \, \mbox{Area of a circle}}{\partial t}-\nabla \mbox{Area of a circle} =\pi r^2-\pi ab$

more complex under acceleration.
Ah, mixed derivatives!
Would they be called "mixed Greeks"?
or messed

Cuchulainn
Posts: 61589
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

A Hellenic of a slippery slope!
http://www.datasimfinancial.com
http://www.datasim.nl

Every Time We Teach a Child Something, We Keep Him from Inventing It Himself
Jean Piaget

trackstar
Posts: 27305
Joined: August 28th, 2008, 1:53 pm

Wait - you are in the Canary Islands?  Not to be confused with Canary Wharf...
Hopefully safely back in the UK by now...

Coronavirus Rattles Asian Markets As 1,000 Guests Are On Lockdown In Tenerife Hotel Linked To Illness - Forbes Feb 25
• Stocks in Asia continued to fall on Tuesday, with Japan’s Nikkei seeing the steepest fall of 3%, while China’s Shanghai Composite fell 1.6%. On Monday, U.S. stocks saw their steepest fall in two years, with the Dow falling more than 1,000 points.
• Spain's IBEX 35 Index was down 1.28%, and Italy's MIB fell 0.92% at the midmarket following Monday's sell off.
• Some 1,000 people have been quarantined at a hotel in Tenerife in Spain’s Canary islands and await testing, after a visiting Italian doctor tested positive for the virus.

ISayMoo
Posts: 2293
Joined: September 30th, 2015, 8:30 pm

Berlin inquiry doesn’t know how many boys were given to abusers
By the late 1960s the West Berlin authorities were at their wits’ end. Hundreds of children had run away from home and were wandering the streets, in some cases openly selling themselves in the archways of the Zoological Garden station.
Then one of the rising stars of German social science came up with a solution: why not move them in with paedophiles? The boys would fall in love with their new father figures, Helmut Kentler argued, and learn to form stable relationships in the adult world.
On Kentler’s advice, for 30 years or more the city hall placed an unknown number of homeless children with foster fathers who had been convicted of sexually abusing minors.
Some of the victims say they were raped, isolated from the world and subjected to psychological torment. One died, allegedly through being denied proper medical care.
I can't believe how they could have been so insane as to come up with this project and support it for 30 years.

Collector
Posts: 4575
Joined: August 21st, 2001, 12:37 pm

Everything closed down here

I am going to Monaco

Paul
Posts: 10488
Joined: July 20th, 2001, 3:28 pm

I’ve got the battery charger. Yay!

All rechargeable batteries sold out. Boo!

(Actual batteries? Loads of them in the shops!)

katastrofa
Posts: 8975
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Everything closed down here

I am going to Monaco
I told you get a cat (or better two). You'd never feel lonely.

Cuchulainn
Posts: 61589
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Everything closed down here

I am going to Monaco
I told you get a cat (or better two). You'd never feel lonely.
Codex Karlsen, page 492 UnifiedR

2c/(1-v^2/c^2)

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

Every Time We Teach a Child Something, We Keep Him from Inventing It Himself
Jean Piaget

Collector
Posts: 4575
Joined: August 21st, 2001, 12:37 pm

Codex Karlsen sadly disappeared some years ago. My first cat disappeared once for a full year (went out travel and mate, big male cat) then suddenly returned, so still hope, but not high.
Last edited by Collector on March 22nd, 2020, 11:48 am, edited 1 time in total.

Cuchulainn
Posts: 61589
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Sorry to hear that..
http://www.datasimfinancial.com
http://www.datasim.nl

Every Time We Teach a Child Something, We Keep Him from Inventing It Himself
Jean Piaget

katastrofa
Posts: 8975
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Codex Karlsen sadly disappeared some years ago. My first cat disappeared once for a full year (went out travel and mate, big male cat) then suddenly returned, so still hope, but not high.

Screen Shot 2020-03-22 at 12.48.01 PM.png
Maybe the skinny black cat in the forest was him!?!

BTW, they closed pubs and cafes. I have crowds crawling along the river in front of my house, and groups drinking beer in every corner. Now they are closing parks. I'm not sure it works as they intended.

Paul
Posts: 10488
Joined: July 20th, 2001, 3:28 pm

Codex Karlsen sadly disappeared some years ago. My first cat disappeared once for a full year (went out travel and mate, big male cat) then suddenly returned, so still hope, but not high.

Screen Shot 2020-03-22 at 12.48.01 PM.png
Maybe the skinny black cat in the forest was him!?!

BTW, they closed pubs and cafes. I have crowds crawling along the river in front of my house, and groups drinking beer in every corner. Now they are closing parks. I'm not sure it works as they intended.
I'm seeing similar, mainly people in their 20s. It's understandable. And it's only a few days into (sort of) lockdown! I'd prefer that parks, beaches, other large open areas, were kept open. With volunteers reminding people to keep their distances from each other.

katastrofa
Posts: 8975
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

A couple of days ago I popped in a local pub to buy some bottles. There were around 8 people seated sparsely in the large space. It looked similar in cafes. I think it was safer than what's happening now. I try to keep distance in the street - as usual (my social phobia), but it's not at all reciprocated.

Paul
Posts: 10488
Joined: July 20th, 2001, 3:28 pm

Increased attack rate on wilmott.com from IP addresses in...China. (Just saying without comment!)

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