10:58
$$\require{AMScd}
\begin{CD}
K(X) @>{ch}>> H(X;\mathbb Q);\\
@VVV @VVV \\
K(Y) @>{ch}>> H(Y;\mathbb Q);
\end{CD}$$
\begin{CD}
K(X) @>{ch}>> H(X;\mathbb Q);\\
@VVV @VVV \\
K(Y) @>{ch}>> H(Y;\mathbb Q);
\end{CD}$$
Ok, this works. Since I am not familiar with AMScd syntax and I more often use xypic, probably a more natural solution for me is to use presheaf website and then include the picture.
The above is what I get after typing this into presheaf:
K(X) \ar^{ch}[r] \ar[d] & H(X,\mathbb Q) \ar[d]\\
K(Y) \ar^{ch}[r] & H(Y,\mathbb Q)
K(X) \ar^{ch}[r] \ar[d] & H(X,\mathbb Q) \ar[d]\\
K(Y) \ar^{ch}[r] & H(Y,\mathbb Q)
Presheaf provided me also with this link - I am not sure how stable it is: presheaf.com/?d=d436d21r6r3h1w5p565g6o2i5m5l2c1v
2 hours later…
13:45
14:45
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22:51
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