An infinitesimal derivative of the Bott class is defined by generalizing
Heitsch'es construction. We prove a formula relating the infinitesimal
derivative to the Schwarzian derivatives, which gives a generalization of the
Maszczyk formula for the Godbillon-Vey class of real codimension-one foliations.
As an application, a residue of infinitesimal derivatives with respect to the
Julia set in the sense of Ghys, Gomez-Mont and Saludes is introduced.
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