Keywords: PseudoRing.png Source <pre> \documentclassa4paper article \usepackagedvips matrix arrow ps color line curve frame xy \usepackage diagxy \thispagestyle empty \begin document \bfig \qtriangle / ->`>`-->/ A`A_1`R ; i`\varphi`\varphi 1 \efig \end document </pre> This source is then proceeded through the commands <pre> latex source tex dvips source dvi ps2eps source ps pstopnm -portrait -xmax 180 source eps pnmtopng source eps001 ppm > source png </pre> en A commutative diagram about Dorroh extension own Touriste Commutative triangles Ring theory Images with LaTeX source code |