Re: Question about Pluecker coordinates

On 29 Lug, 15:53, Kaba <n...@xxxxxxxx> wrote:
In article <5cd43c91-2b4c-4a53-a2d5-cc5741826e91
@m73g2000hsh.googlegroups.com>, anonimo.passa...@xxxxxxxxx says...

Hmm.. Something still worries me. The problem is the last one: angle
with respect to what?

What matters?

See below.

In my case, you need 2 numbers to specify the direction of the line,
then you're left with a 2-dimensional complement (say, the plane thru
the origin and normal to that direction) and you need 2 more numbers
to choose a point on that plane.

Coordinates do not make sense without a coordinate frame which they are
with respect to. What is the coordinate frame of the plane?

You need two numbers to identify a point on a plane independently of
the coordinate frame.
.