Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Education » mathedcc

Topic: One or two arrows on a coordinate axis?
Replies: 21   Last Post: Jan 26, 2012 12:53 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
DCJLEE@AOL.COM

Posts: 26
Registered: 12/6/04
One or two arrows on a coordinate axis?
Posted: Jan 19, 2012 8:28 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply
att1.html (2.4 K)

I've always thought that a cartesian coordinate axis consists of
(1) a straight line with a distinguished point representing 0,
(2) an orientation, indicated by an arrow, that indicates the
direction of increasing coordinate values, and
(3) a unit, representing 1, located away from 0 on the side
of the arrow:
0 1
-----------------------------------|---------|------------------------------
------>

Recently, in discussions with fellow instructors at a Ph.D.
granting university, I became aware that there are actually
two "camps" regarding this issue:
(I) One arrow on each axis, as described above, and
(II) Two arrows on each axis (presumably to indicate that
the axis is supposed to be extended indefinitely at both ends),



0 1
<-----------------------------------|---------|-----------------------------
------->


as exemplified by this statement:
>>>
It's not anything that I've ever thought about before, but I'd probably
consider myself in the "double-arrow camp" on the axes.
>>>

Any comment or clarification on this matter will be much appreciated.

John Lee






Date Subject Author
1/19/12
Read One or two arrows on a coordinate axis?
DCJLEE@AOL.COM
1/19/12
Read Re: One or two arrows on a coordinate axis?
Guy Brandenburg
1/20/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/20/12
Read Re: One or two arrows on a coordinate axis?
Clyde Greeno @ MALEI
1/20/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/21/12
Read Re: One or two arrows on a coordinate axis?
Phil Mahler
1/21/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/22/12
Read RE: One or two arrows on a coordinate axis?
Laura Bracken
1/22/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/22/12
Read Re: One or two arrows on a coordinate axis? <not again!>
RotmanJ
1/22/12
Read Re: One or two arrows on a coordinate axis? <not again!>
Clyde Greeno @ MALEI
1/22/12
Read Re: One or two arrows on a coordinate axis? <not again!>
Alain Schremmer
1/23/12
Read Re: One or two arrows on a coordinate axis? <not again!>
Wayne Mackey
1/24/12
Read RE: One or two arrows on a coordinate axis? <not again!> <still
not again>
RotmanJ
1/24/12
Read Re: One or two arrows on a coordinate axis? <not again!> <still not again>
Alain Schremmer
1/26/12
Read Re: One or two arrows on a coordinate axis? <not again!> <still not
again>
Wayne Mackey
1/20/12
Read Re: One or two arrows on a coordinate axis?
Wayne Mackey
1/21/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/21/12
Read Re: One or two arrows on a coordinate axis?
Clyde Greeno
1/21/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer
1/21/12
Read Re: One or two arrows on a coordinate axis?
Phil Mahler
1/21/12
Read Re: One or two arrows on a coordinate axis?
Alain Schremmer

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.