Image:Projective module.png
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Illustration of defining property of projective modules. The file was created by Axel Boldt with the Xy-Pic package for TeX; it is in the public domain. The source code, also in the public domain, was the following:
% Produce a postscript file from this input with tex and dvips. % Loading the XY-Pic package: \input xy \xyoption{all} % Using postscript driver for smoother curves \xyoption{ps} \xyoption{dvips} % No need for page numbers \nopagenumbers $$ \xymatrix{ %Our diagram is a 2x2 matrix with the upper left entry emtpy & N\ar@{->>}[d]^f\\ P\ar@{.>}[ur]^{\exists h}\ar[r]^g & M } $$ \end
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