A diagram of the relationships between the separation axioms .
Source: Toby Bartels , with help from Dbenbenn .
Licence: No rights reserved. See http://tobybartels.name/copyright/
. The image itself is pure information and thus probably not copyrightable . The source below is more likely to be copyrightable, but there are still no rights reserved.
TeX source by Toby Bartels using Xy-pic:
%&plain
\def \frac #1#2{{\mathstrut #1\over \mathstrut #2}}
\input xy
\xyoption {all}
\xyoption {ps}
\xyoption {dvips}
\nopagenumbers
\xymatrix @!0 { & \relax \rm \bullet / T _ 6 \\
\relax \rm P N / \bullet \ar @{-} [ur] & &
\relax \rm \bullet / T _ 5 \ar @{-} [ul] \\
& \relax \rm C N / \bullet \ar @{-} [ul] \ar @{-} [ur] &
& \relax \rm \bullet / T _ 4 \ar @{-} [ul] \\
& & \relax \rm N / \bullet \ar @{-} [ul] \ar @{-} [ur] &
& \relax \rm C R / T _ { 3 \frac 1 2 } \ar @{-} [ul] \\
& & & & & \relax \rm \bullet / \bullet \ar @{-} [ul] \\
& & & & \relax \rm \bullet / C T _ 2 \ar @{-} [ur] &
& \relax \rm R / T _ 3 \ar @{-} [ul] \\
& & & & &
\relax \rm \bullet / T _ { 2 \frac 1 2 } \ar @{-} [ul] \ar @{-} [ur] \\
& & & & \relax \rm R _ 1 / T _ 2 \ar @{-} [ur] \\
& & & \relax \rm R _ 0 / T _ 1 \ar @{-} [ur] \\
& & - / \rm T _ 0 \ar @{-} [uuuuuu] \ar @{-} [ur] }
\bye
To produce the current image, I saved the above as "Separation_axioms.tex", then ran the following commands:
tex Separation_axioms.tex
dvips -mode ljfzzz -D 1200 Separation_axioms -o
convert -density 1200 Separation_axioms.ps Separation_axioms.pnm
pnmcrop Separation_axioms.pnm | pnmtopng > Separation_axioms.png.uncrush
pngcrush -cc -reduce -brute -l 9 Separation_axioms.png.uncrush Separation_axioms.png
(Thanks to Dbenbenn for the commands!)
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