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Published online by Cambridge University Press: 20 January 2009
Schouten and van Kampen (1) have studied the deformation of a  . Applying the methods of that paper to the tangent vectors
. Applying the methods of that paper to the tangent vectors  , which exist by hypothesis at all points of a certain region Vm′ (m′ > m) of Vn, we shall have
, which exist by hypothesis at all points of a certain region Vm′ (m′ > m) of Vn, we shall have

Whence we define the differentials

In the application of the  to
 to  the lower index is treated as an ordinal index only. We shall not be concerned with any extension of the
 the lower index is treated as an ordinal index only. We shall not be concerned with any extension of the  to indices other than those of the general Vb (see 1, equ. 3.24).
 to indices other than those of the general Vb (see 1, equ. 3.24).