Master thesis on Rational Homotopy Theory https://github.com/Jaxan/Rational-Homotopy-Theory
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\xymatrix{
A \xypo \ar[r] \arcof[d]_{(\simeq)}^i & C \ar[d]^j \\
B \ar[r] & P
}
\qquad
\xymatrix{
P \xypb \ar[r] \ar[d]^q & X \arfib[d]_{(\simeq)}^p \\
Z \ar[r] & Y
}