[Jprogramming] j805 raspberry refreshed

[bill lam]

The following files for j805 raspberry pi has been
refreshed to fix some installation related bugs
reported in forum.

http://www.jsoftware.com/download/j805/install/
j805_armhf.deb  2017-08-20 07:24
j805_raspi32.tar.gz 2017-08-20 06:54

http://www.jsoftware.com/download/j805/qtide/
jqt-raspi-32.tar.gz  2017-08-20 08:44

For deb installation, ijconsole should work
without any problems. But after install jqt
with sudo ijconsole,
it needs to add a symlink manually:

cd /lib/arm-linux-gnueabihf/
sudo ln -s libjqt.so libjqt.so.8.05
sudo ldconfig

The above is not needed for tar.gz install.

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Re: [Jprogramming] "n-volume" of an "n-sphere"

[Murray Eisenberg]

Re Don Kelly’s comment:

   NO the ball of radius r at a point p in n-space is the set of all points of 
distance strictly less than than r from p;
 the disk of radius r at a point p in n-space is the set of all points 
of distance at most r from p.
  
   “Infinitesimal” has utterly nothing to do with it, nor does transfinite math 
(although the set of points in such a ball, or such a disk, is definitely 
infinite and, in fact, uncountable.

Re Jimmy Gauvin’s comment:

 It is utterly trivial to prove that a ball (or disk) in euclidean n-space 
is convex. It requires nothing more than what is commonly taught in standard 
courses in sophomore linear algebra today. Specifically, basic properties of 
the euclidean norm, including the triangle inequality.

> On 2Sat, 19 Aug 2017 18:03:49 -0700,Don Kelly  > wrote:
> 
> If one considers a point as infinitesimal -as usually considered-, then 
> we have an infinite number of points at an infinitesimal distance from 
> the origin and at a larger distance from the origin there are still an 
> infinite number of points on the surface and  an infinite number of 
> points enclosed . Isn't this getting into transfinite math?
> 
> What's the point?
> 
> Don Kelly
> 
> 
> On 2017-08-15 8:23 PM, Jimmy Gauvin wrote:
>> The construction of the sphere implies it cannot be convex but you will
>> have to find a topologist to prove it to you.
>> 
>> The sphere is the collection of points whose distance to the origin is
>> equal to the radius of the sphere.
>> 
>> The ball or volume is comprised of the points whose distance to the origin
>> is equal or smaller than the radius of the sphere.

——
Murray Eisenbergmur...@math.umass.edu
Mathematics & Statistics Dept.   
Lederle Graduate Research Tower  phone 240 246-7240 (H)
University of Massachusetts
710 North Pleasant Street 
Amherst, MA 01003-9305




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Re: [Jprogramming] "n-volume" of an "n-sphere"

[Don Kelly]

Possibly I had an incomplete description of the problem but the use of 
"point" brought up the problem of "how big is a point?".


Your definitions below do help -and also make the problem more 
interesting for n>3


Don

On 2017-08-20 7:33 AM, Murray Eisenberg wrote:

Re Don Kelly’s comment:

NO the ball of radius r at a point p in n-space is the set of all points of 
distance strictly less than than r from p;
  the disk of radius r at a point p in n-space is the set of all points 
of distance at most r from p.
   
“Infinitesimal” has utterly nothing to do with it, nor does transfinite math (although the set of points in such a ball, or such a disk, is definitely infinite and, in fact, uncountable.


Re Jimmy Gauvin’s comment:

  It is utterly trivial to prove that a ball (or disk) in euclidean n-space 
is convex. It requires nothing more than what is commonly taught in standard 
courses in sophomore linear algebra today. Specifically, basic properties of 
the euclidean norm, including the triangle inequality.


On 2Sat, 19 Aug 2017 18:03:49 -0700,Don Kelly mailto:d...@shaw.ca>> wrote:

If one considers a point as infinitesimal -as usually considered-, then
we have an infinite number of points at an infinitesimal distance from
the origin and at a larger distance from the origin there are still an
infinite number of points on the surface and  an infinite number of
points enclosed . Isn't this getting into transfinite math?

What's the point?

Don Kelly


On 2017-08-15 8:23 PM, Jimmy Gauvin wrote:

The construction of the sphere implies it cannot be convex but you will
have to find a topologist to prove it to you.

The sphere is the collection of points whose distance to the origin is
equal to the radius of the sphere.

The ball or volume is comprised of the points whose distance to the origin
is equal or smaller than the radius of the sphere.

——
Murray Eisenbergmur...@math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower  phone 240 246-7240 (H)
University of Massachusetts
710 North Pleasant Street
Amherst, MA 01003-9305




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Re: [Jprogramming] j805 raspberry refreshed

[bill lam]

deb package updated again for desktop shortcut.

-- 
regards,

GPG key 1024D/4434BAB3 2008-08-24
gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3
gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3
--
For information about J forums see http://www.jsoftware.com/forums.htm