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 11673₈ 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 3×277 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 10000000011111₂ 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 201F₁₆ Posts	A couple cool tricks: $\today[2]$ $\calendar$

2006-02-10, 04:10	#27
Xyzzy "Mike" Aug 2002 3×2,741 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 110000010₂ 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 5 Posts	thanks for your reply