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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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