created with Latex using the code (using package xypic)
\begin{equation}
\xymatrix{
X \ar[dr]_{\tilde{f}}
\ar[rr]^f
&
{}
&
Y
\\
&
M_f \ar[ru]
}
\end{equation}
== Summary == created with Latex using the code (using package xypic) \begin{equation} \xymatrix{ X \ar[dr]_{\tilde{f}} \ar[rr]^f & {} & Y \\ & M_f \ar[ru] } \end{equation} {{Information| |Description = commutative diagram for mapping cylinder