1. diagram

Hi . can you help me?
I can't draw it:

who can help me? thanks

2. Re: diagram

If you need help with a question to do with this, you can just post the picture you've drawn.

Or do you need to know the LaTeX code for some other purpose?

3. Re: diagram

Originally Posted by Prove It
If you need help with a question to do with this, you can just post the picture you've drawn.

Or do you need to know the LaTeX code for some other purpose?
I can't write LaTeX code for it
i need latex code

4. Re: diagram

This diagram is too complex for me to write it in full. You can start with the following TikZ code.

Code:
\usetikzlibrary{positioning,arrows}

\begin{tikzpicture}[auto,>=stealth']
\node (N1) {$\llap{$\tilde e:{}$}N_1 \times N_r$};
\node[right=of N1] (L1) {$\tilde L$};
\node[above=of N1] (N) {$\llap{$e_r:{}$}N_r$};
\node[above=of L1] (L) {$L_r$};
\draw[->>] (N1) -- node[swap] {$\sigma_r$} (N);
\draw[->>] (L1) -- node[swap] {$\tau_r$} (L);
\draw[to reversed->] (N) -- node {$\chi_r$} (L);
\draw[to reversed->] (N1) -- (L1);
\path[use as bounding box] (-1.3,0) rectangle (0,0); % adds to the bounding box to include \tilde e: from node N1
\end{tikzpicture}

5. Re: diagram

Originally Posted by emakarov
This diagram is too complex for me to write it in full. You can start with the following TikZ code.

Code:
\usetikzlibrary{positioning,arrows}

\begin{tikzpicture}[auto,>=stealth']
\node (N1) {$\llap{$\tilde e:{}$}N_1 \times N_r$};
\node[right=of N1] (L1) {$\tilde L$};
\node[above=of N1] (N) {$\llap{$e_r:{}$}N_r$};
\node[above=of L1] (L) {$L_r$};
\draw[->>] (N1) -- node[swap] {$\sigma_r$} (N);
\draw[->>] (L1) -- node[swap] {$\tau_r$} (L);
\draw[to reversed->] (N) -- node {$\chi_r$} (L);
\draw[to reversed->] (N1) -- (L1);
\path[use as bounding box] (-1.3,0) rectangle (0,0); % adds to the bounding box to include \tilde e: from node N1
\end{tikzpicture}
thanks a lot my freind. now i underestand some thing.
but please say to me, how draw it:

6. Re: diagram

Code:
\usetikzlibrary{arrows,positioning}
\begin{tikzpicture}[>=stealth',auto]
\node (top) {$\llap{$\tilde e:{}$}N_1\times N_2$};
\node[below=1.5cm of top] (mid) {$\llap{$e_1\times A:{}$}N_1\times A$};
\node[below=1.5cm of mid] (bot) {};
\draw[stealth' reversed->] (top) -- node {$\sigma$} (mid);
\draw[->>] (mid) -- node {$\mathsf{nat}'$} (bot);
\path (top) edge[->,dashed,bend right] (bot);
%or: \draw[->,dashed] (top) to[bend right] (bot);
\path[use as bounding box] (-2,0) -- (0,0);
\end{tikzpicture}