my blog lives here now
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

23 lines
860 B

  1. \node (a) at (-1, 0) {$a$};
  2. \node (a0) at (0, 0.75) {$a$};
  3. \node (a1) at (0, -0.75) {$a$};
  4. \draw[->] (a0) -- node[midway] (al) {} (a1);
  5. \draw[dashed,->] (a) to[] node[midway,above] {$\sigma$} ([xshift=-0.5em]al);
  6. \node (fi0) at (1, 0.75) {$a$};
  7. \node (fi1) at (1, -0.75) {$b$};
  8. \draw[->] (fi0) -- node[midway,right] (f) {f} (fi1);
  9. \node (fi0j1) at (4 + -0.75, 0.75) {$a$};
  10. \node (fi0j0) at (4 + -0.75, -0.75) {$a$};
  11. \node (fi1j1) at (4 + 0.75, 0.75) {$b$};
  12. \node (fi1j0) at (4 + 0.75, -0.75) {$b$};
  13. \draw[->] (fi0j1) -- (fi1j1) node[midway] (fs) {f};
  14. \draw[->] (fi0j0) -- (fi1j0) node[midway,below] (gs) {f};
  15. \draw[<-] (fi0j0) -- (fi0j1) node[midway,left] (p) {};
  16. \draw[<-] (fi1j0) -- (fi1j1) node[midway,right] (q) {};
  17. \node (sq) at (4, 0) {$\bullet$};
  18. \draw[dashed,->] (f) to[out=20,in=160] node[midway,below] {$\sigma_0 \circ \sigma$} (sq);