drgfresh
Rank #25435 on Comments
Level 125 Comments: Respected Member Of Famiry Offline
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Gender:  male 
Age:  25 
Date Signed Up:  2/29/2012 
Last Login:  7/22/2016 
Location:  Vienna 
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latest user's comments
#664  just to see colour  07/12/2016 on is this still relevant?  0 
#63  the bad part is that people are still singing to the songs [+] (1 new reply)  11/01/2013 on Disco  0 
#5  parallel lines meet in infinity... [+] (10 new replies)  10/16/2013 on trigonometry  +2 
#21 
kanedam (10/16/2013) [] If you are talking about ordinary lines and ordinary geometry, then parallel lines do not meet. For example, the line x=1 and the line x=2 do not meet at any point, since the x coordinate of a point cannot be both 1 and 2 at the same time. In this context, there is no such thing as "infinity" and parallel lines do not meet. However, you can construct other forms of geometry, socalled nonEuclidean geometries. For example, you can take the usual points of the plane and attach to them an additional point called "infinity" and consider all lines to also include this additional point. In this context, there is a single "infinity" location where all lines meet. In a geometry like this, all lines intersect at infinity, in addition to any finite point where they might happen to meet. Or, you could attach not just one additional point, but a whole collection of additional points, one for each direction. Then you can consider two parallel lines to meet at the extra point corresponding to their common direction, whereas two nonparellel lines do not intersect at infinity but intersect only at the usual finite intersection point. This is called projective geometry, and is described in more detail in the answer to another question. In summary, then: in usual geometry, parallel lines do not meet. There is no such thing as infinity, and it is wrong to say that parallel lines meet at infinity. However, you can construct other geometric systems, whose "points" include not only the points of familiar geometry (describable as coordinate pairs (x,y)), but also other objects. These other objects can be constructed in various ways, as described in the discussion of projective geometry. In these other geometric systems, parallel lines may meet at a "point at infinity". Whether this is one single point or different points for different classes of parallel lines, depends on the particular geometric system you are considering.  
#10  Since it's an undersea cable the only thing different between …  09/30/2013 on undersea cable  0 
#25  Comment deleted  06/16/2013 on Possible future fire starters  0 
#32  Comment deleted  03/22/2013 on My Art Progression  0 
#66  not the **** stuff to blue all the sfw stuff is blue [+] (2 new replies)  01/17/2013 on /b/ at its best  0 
 
#21  he got shot  01/11/2013 on Batman  +9 
#7533  Tell me Funnyjunk What is the best way to train my Waist? [+] (3 new replies)  11/28/2012 on Fitness  muscle and...  0 
 
#6  Comment deleted  11/17/2012 on When i forgot to put my hood  0 