• The natural transformation
    \[ \alpha \colon \text{Lan}_{h_{F}}\webleft (h^{F}\webright )\Longrightarrow h \]

    with components

    \[ \alpha _{B',B}\colon \int ^{A\in \mathcal{C}}h^{B'}_{F_{A}}\times h^{F_{A}}_{B}\to h^{B'}_{B} \]

    given by

    \[ \alpha _{B',B}\webleft (\webleft [\webleft (\phi ,\psi \webright )\webright ]\webright )=\psi \circ \phi \]

    is a natural isomorphism.


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