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!)
|
本作品的著作权持有者允许任何人以任何目的使用该作品,包括无限制的再分发、商业性使用和修改内容。
请检查来源以确保该说明准确无误。尤其请注意在互联网出版物,就像以其他方式出版物一样,本身并不意味着允许重新分发。没有有效授权的文件应标记{{subst:npd}}。
使用注意:
Copyrighted free useCopyrighted free usefalsefalse
|