Math rendering engine - Page 3

jinydu · 2005-12-22, 10:42

Does anyone know how to write the "Dell" symbol (the "upside-down" equilateral triangle that denotes the gradient)?

axn · 2005-12-22, 11:07

[ tex ] \nabla [ /tex ]

$\nabla$

Hint: Search for "Gradient" in wikipedia

Xyzzy · 2006-02-08, 16:20

A couple cool tricks:

$\today[2]$

$\calendar$

Fusion_power · 2006-02-08, 17:18

This one is just to see if the html linking works.

[html]
<img src=http://www.selectedplants.com/gardenphotos/sena.jpg>
[/html]

So it doesn't seem to pull this no matter how I modify the img string. Is it restricted to prevent attaching photos off of the net?

Fusion

Xyzzy · 2006-02-10, 04:10

Remote linking of images is dangerous because people can change the target down the road and inject in nasty pictures. It is much easier to just allow attachments.

yucell · 2006-02-28, 09:58

(2^k)+1=prime????

k for 2=5

k for 4=17

k for 16=65537

k for 256=............

k for 65536=.............

k for 4294967296=...............

can it be?

Greenbank · 2006-02-28, 11:52

No.

2^256+1 has a factor 1238926361552897.

yucell · 2006-03-04, 22:45

121645100409356287 is it a prime?

Mystwalker · 2006-03-04, 23:03

No:

121645 100409 356287 = 25561 x 4 759011 791767

Smaller numbers (<50 digits) can be easily tested with http://www.alpertron.com.ar/ECM.HTM

yucell · 2006-03-04, 23:11

thanks for your reply

Xyzzy · 2006-03-05, 02:03

Small ones can be checked in Linux.

Code:

$ factor 121645100409356287
121645100409356287: 25561 4759011791767

2005-12-22, 11:07	#24
axn Jun 2003 5,051 Posts	[ tex ] \nabla [ /tex ] $\nabla$ Hint: Search for "Gradient" in wikipedia Last fiddled with by axn on 2005-12-22 at 11:08

2006-02-08, 17:18	#26
Fusion_power Aug 2003 Snicker, AL 7·137 Posts	This one is just to see if the html linking works. [html] <img src=http://www.selectedplants.com/gardenphotos/sena.jpg> [/html] So it doesn't seem to pull this no matter how I modify the img string. Is it restricted to prevent attaching photos off of the net? Fusion Last fiddled with by Fusion_power on 2006-02-08 at 17:21

2006-03-04, 23:03	#31
Mystwalker Jul 2004 Potsdam, Germany 1100111111₂ Posts	No: 121645 100409 356287 = 25561 x 4 759011 791767 Smaller numbers (<50 digits) can be easily tested with http://www.alpertron.com.ar/ECM.HTM Last fiddled with by Mystwalker on 2006-03-04 at 23:04

2006-03-05, 02:03	#33
Xyzzy "Mike" Aug 2002 3·2,741 Posts	Small ones can be checked in Linux. Code: $ factor 121645100409356287 121645100409356287: 25561 4759011791767

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2005-12-22, 10:42	#23
jinydu Dec 2003 Hopefully Near M48 2·3·293 Posts	Does anyone know how to write the "Dell" symbol (the "upside-down" equilateral triangle that denotes the gradient)?

2006-02-08, 16:20	#25
Xyzzy "Mike" Aug 2002 3·2,741 Posts	A couple cool tricks: $\today[2]$ $\calendar$

2006-02-10, 04:10	#27
Xyzzy "Mike" Aug 2002 201F₁₆ Posts	Remote linking of images is dangerous because people can change the target down the road and inject in nasty pictures. It is much easier to just allow attachments.

2006-02-28, 09:58	#28
yucell Feb 2006 İSTANBUL 5 Posts	(2^k)+1=prime???? k for 2=5 k for 4=17 k for 16=65537 k for 256=............ k for 65536=............. k for 4294967296=............... can it be?

2006-02-28, 11:52	#29
Greenbank Jul 2005 2×193 Posts	No. 2^256+1 has a factor 1238926361552897.

2006-03-04, 22:45	#30
yucell Feb 2006 İSTANBUL 5 Posts	121645100409356287 is it a prime?

2006-03-04, 23:11	#32
yucell Feb 2006 İSTANBUL 5₁₆ Posts	thanks for your reply