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Re: [ccp4bb] intersection curve of cone with cylinder
 

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CCP4bb <-- 2008 <-- March 2008 <-- 20 March 2008
Previous message:
Subject: Re: Back-Fourier transforming an EM map with SFALL
From: Alejandro Buschiazzo alebus {- at -} PASTEUR {- dot -} FR
Date: 2008-03-20 		Next message:
Subject: Input to STFC
From: John R Helliwell jrhelliwell {- at -} GMAIL {- dot -} COM
Date: 2008-03-20


Subject: Re: intersection curve of cone with cylinder
From: artem {- at -} XTALS {- dot -} ORG artem {- at -} XTALS {- dot -} ORG
Date: 2008-03-20
In topology, long time ago, I was taught that these are indeed
'intersection curves of surfaces of the second order'. Emphasis on surface
being second order, not the curve. This was in Russian, which means that
the English terms may be different. You might also encounter 'intersection
curves of quadric surfaces'. There are seventeen types of quadric surfaces
(including real and imaginary ones) and they're a right pain in the neck
to calculate intersections of.

Artem

> Dear All -
>
> if memory serves me right, the intersection curve of
> a cone with a cylinder (like in a powder diffraction camera) is
> not an ellipse, but a "Schnittfigur zweiter Ordnung",
> loosly translated as 'intersection curve of second order'.
>
> Is there a correct English term for that type of curve?
>
> Thx, br
> -----------------------------------------------------------------
> Bernhard Rupp
> 001 (925) 209-7429
> +43 (676) 571-0536
> br@qedlife.com
> bernhardrupp@sbcglobal.net
> http://www.ruppweb.org/
> -----------------------------------------------------------------
> The hard part about playing chicken
> is to know when to flinch
> -----------------------------------------------------------------
>

CCP4bb navigation

CCP4bb <-- 2008 <-- March 2008 <-- 20 March 2008
Previous message:
Subject: Re: Back-Fourier transforming an EM map with SFALL
From: Alejandro Buschiazzo alebus {- at -} PASTEUR {- dot -} FR
Date: 2008-03-20 		Next message:
Subject: Input to STFC
From: John R Helliwell jrhelliwell {- at -} GMAIL {- dot -} COM
Date: 2008-03-20


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