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#################################################################
American Mathmatical Society
#################################################################

All commands below came with package amscd.
\usepackage{amscd} ::amscd::

#################################################################
diagrams ::CD::
#################################################################
subenviroment :
CD
example :
\begin{CD}
 A @>>> B @>>> C 
 D @AAA E @VVV F 
 G @=   H @<<< I  
\end{CD}

enviroment for diagrams
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@>textabove>textbelow>

arrow to the right with writing above and below
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@<textabove<textbelow<

arrow to the left with writing above and below
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@AtextleftAtextrightA

arrow up with writing at the left and right side
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@VtextleftVtextrightV

arrow down with writing at the left and right side
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@=

equal symbol instead of an arrow