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Commutative diagram illustrating a universal cone (or a limit in category). Can also be used to any depict a morphism of cones.

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\begin{diagram}
& & N & & \\
& \ldTo(2,4)^{\psi_X} & \dDashTo~u &\rdTo(2,4)^{\psi_Y} & \\
& & L & & \\
& \ldTo(2,2)_{\makebox[5pt]{$\phi_X$}} & & \rdTo(2,2)_{\makebox[0pt]{$\phi_Y$}} & \\
F(X) & & \rTo_{F(f)} & & F(Y) \\
\end{diagram}