Vrftsjtryk

How to properly align Tikz pictures in Latex environment to get the following picture?

My trial code does not compile,

documentclass[preview]{standalone}

usepackage{tikz}

usepackage{amsmath}

begin{document}



begin{equation*}

    A = frac{%

        begin{tikzpicture}

            draw (0,0) to[bend left] (1,0) to[bend left] (0,0);

        end{tikzpicture}

    }{%

        begin{tikzpicture}

            defL{1.0} 

            matrix[column sep=.1cm, row sep=2mm]

            {   

                draw (0,0) to[bend left] (L,0) to[bend left] (0,0);

                &

                node at (0,0) {$-$};

                &

                draw[dashed] (0,0) -- (L,0);

                draw[xshift=L cm] (0,0) to[bend left] (L,0) to[bend left] (0,0); \

            };

        end{tikzpicture}

    }

end{equation*}



end{document}

Generally you can control the vertical alignment with the baseline option.

documentclass{article}

usepackage{amsmath}

usepackage{tikz}

begin{document}

begin{equation*}

    A = frac{%

        begin{tikzpicture}[baseline={(0,-0.1)}]

            draw (0,0) to[bend left] (1,0) to[bend left] (0,0);

        end{tikzpicture}

    }{%

    begin{tikzpicture}[baseline={(0,-0.1)}]

            draw (0,0) to[bend left] (1,0) to[bend left] (0,0);

     end{tikzpicture}

     -

    begin{tikzpicture}[baseline={(0,-0.1)}]

            draw (0,0) to[bend left] (1,0) to[bend left] (0,0);

            draw[dashed](0,0) -- (-1,0);

     end{tikzpicture}

    }

end{equation*}



end{document}

I don't know what these objects represent, so you may want to use another baseline.

Note that you can use a TikZ matrix:

documentclass{article}

usepackage{tikz}

usepackage{amsmath}

begin{document}



begin{equation*}

    A = frac{%

        begin{tikzpicture}[baseline]

            draw (0,0) to[bend left] (1,0) to[bend left] (0,0);

        end{tikzpicture}

    }{%

        begin{tikzpicture}[baseline]

            defL{1.0} 

            matrix[column sep=.1cm, row sep=2mm,ampersand replacement=&]

            {   

                draw (0,0) to[bend left] (L,0) to[bend left] (0,0);

                &

                node at (0,0) {$-$};

                &

                draw[dashed] (0,0) -- (L,0);

                draw[xshift=L cm] (0,0) to[bend left] (L,0) to[bend left] (0,0); \

            };

        end{tikzpicture}

    }

end{equation*}



end{document}

documentclass{article}

usepackage{tikz}



begin{document}

[

A = frac{tikz[baseline=1pt]{draw  (-1.5,0) to[bend left] (-0.5,0) to[bend left] (-1.5,0);}}

         {tikz{draw  (-1.5,0) to[bend left] (-0.5,0) to[bend left] (-1.5,0)

                       ( 0.5,0) to[bend left] ( 1.5,0) to[bend left] ( 0.5,0);

                draw[dashed, shorten >=1mm, shorten <=1mm] (-0.5,0) -- (0.5,0);}

         }

]

end{document}