Bractals
20121021 04:13:22 
Geometry Notation
Is anybody familiar with the following notation?
P•Q•R denotes collinear points P, Q, and R
with point Q between points P and R. Clearly, R•Q•P
denotes the same thing. 
Bractals
20121021 04:15:19 
Re: Geometry Notation
I forgot to ask for a source if you are familiar. 
Jer
20121021 23:50:12 
Re: Geometry Notation
I've never seen it.
You could make P•Q•R be a link to a page that defines it. If you do this I would see no problem with using the notation in a problem

brianjn
20121022 01:25:59 
Re: Geometry Notation
Jer makes a good point, particularly if you have the intention of using it repeatedly, otherwise define your notation as a Note and if you need it again then copypaste or reference that Note of that problem.
I've done some lengthy Google Searches and not found anything.
Um. If you decide to create your own page definition may I suggest that it is within the very first comment of the thread definition.

Bractals
20121022 15:02:43 
Re: Geometry Notation
I found it with a google search of "Hilbert's betweenness axioms". Except it uses asterisks instead of bullets. 
Jer
20121023 13:01:32 
Re: Geometry Notation
http://www.skidmore.edu/~mhuibreg/MA%20309/Fall%202008/Hilbert%27s%20Axioms.htm
is an example that uses it. B1. A*B*C implies A, B, C are distinct and collinear, and also C*B*A.
http://en.wikipedia.org/wiki/Hilbert%27s_axioms is the wikipedia article which avoids the notation:
If a point B is between points A and C, B is also between C and A, and there exists a line containing the points A,B,C.
I'd suggest avoiding the notation and just saying "collinear points P,Q,R with Q between P and R" or just "Q is on segment PR." 