Fly by Night (talk | contribs) →Finchley: fair enough |
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:That's a fair point. I hadn't thought of it that way. I've reverted the changes. Thanks Grim23. <span style="white-space:nowrap;">— [[User:Fly by Night|<span style="font-family:Segoe print">'''''Fly by Night'''''</span>]] <font color="#000000">([[User talk:Fly by Night|<span style="font-family:Segoe print">talk</span>]])</font></span> 20:09, 3 October 2010 (UTC) |
:That's a fair point. I hadn't thought of it that way. I've reverted the changes. Thanks Grim23. <span style="white-space:nowrap;">— [[User:Fly by Night|<span style="font-family:Segoe print">'''''Fly by Night'''''</span>]] <font color="#000000">([[User talk:Fly by Night|<span style="font-family:Segoe print">talk</span>]])</font></span> 20:09, 3 October 2010 (UTC) |
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==Three things I need to discuss== |
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1. Britney_Stevens is the sister of Whitney_Stevens. It's listed on Whitney_Stevens that she is listed under the categories Panamanian_Jews and Panamanian_pornographic_film_actors. Since Britney_Stevens is she her sister and a pornstar; should she be listed under those 2 categories as well? |
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2. Qumunity is an article I want to create. It fits under the category LGBT_culture_in_Vancouver becuase Qmunity is Vancouver's centre for gay, lesbian, transgendered, and bisexual people. I think there should be article for it. Here's the link: http://www.qmunity.ca/ |
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3. Naturally Autistic is another article I want to create because it fits under Autism_related_organizations and It's been around since 1995 and it is run a couple in Gibsons,_British_Columbia and I have a link for it: http://www.naturallyautistic.com/founders/297/ |
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Please let me know about doing these articles. Thanks! [[User:Neptunekh2|Neptunekh2]] ([[User talk:Neptunekh2|talk]]) 04:26, 5 October 2010 (UTC) |
Revision as of 04:26, 5 October 2010
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Space of lines and planes
Have a look at Real projective plane#Homogeneous coordinates which explains why in projective space the set of lines in the plane give the real projective plane. If we are working in real space we need to exclude lines through infinity which basically means we remove a curve from the projective plane hence giving a mobius strip.--Salix (talk): 21:47, 8 September 2010 (UTC)
- Thanks Salix! I kind of worked that out today actually. The unoriented lines are given by ax + by + c = 0 which corresponds to the projective point (a:b:c). We want lines, so we have to disallow a = b = 0 which corresponds to removing the projective point (0:0:c) = (0:0:1) from the projective plane. I used the model of the projective plane that's a unit circle centred at the origin, with (±1,0) identified and the upper and lower arcs identified with opposite orientations. Deleting the points (±1,0), which are really just a point in the projective plane, gives two little open arcs around (±1,0). These open arcs can be stretched so the whole set-up gives the square { (x,y) ∈ R2 : −1 < x < 1 and −1 ≤ y ≤ 1} with (x,1) identified with (−x,−1). This is exactly the open Möbius band!
- The space or oriented lines is exactly the open cylinder S1 × R. You choose a point of the circle to give the line's slope, orienting the line anti-clockwise when thought of as tangent to the unit circle. You then choose a perpendicular distance from the origin, allowing negative distances. So the line corresponding to (θ,r) is the same line, but with opposite orientation, as the one corresponding to (θ + π,−r). I'll take a look at the article that you suggested too. Thanks again Salix! — Fly by Night (talk) 19:18, 9 September 2010 (UTC)
Finchley
Hello, I noticed your change to the Notable people section. I think that prose is better for this section as it discourages editors adding names with little or no explanation. The guidelines also prefer prose to lists of this type. Wikipedia:UKTOWNS#Notable_people. Thanks Grim23★ 20:05, 3 October 2010 (UTC)
- That's a fair point. I hadn't thought of it that way. I've reverted the changes. Thanks Grim23. — Fly by Night (talk) 20:09, 3 October 2010 (UTC)
Three things I need to discuss
1. Britney_Stevens is the sister of Whitney_Stevens. It's listed on Whitney_Stevens that she is listed under the categories Panamanian_Jews and Panamanian_pornographic_film_actors. Since Britney_Stevens is she her sister and a pornstar; should she be listed under those 2 categories as well?
2. Qumunity is an article I want to create. It fits under the category LGBT_culture_in_Vancouver becuase Qmunity is Vancouver's centre for gay, lesbian, transgendered, and bisexual people. I think there should be article for it. Here's the link: http://www.qmunity.ca/
3. Naturally Autistic is another article I want to create because it fits under Autism_related_organizations and It's been around since 1995 and it is run a couple in Gibsons,_British_Columbia and I have a link for it: http://www.naturallyautistic.com/founders/297/
Please let me know about doing these articles. Thanks! Neptunekh2 (talk) 04:26, 5 October 2010 (UTC)