Let
be a homogeneous function of order
so that
![]() | (1) |
Then define
and
. Then
![]() | ![]() | (2) | |
![]() | (3) | ||
![]() | (4) |
Let
, then
![]() | (5) |
This can be generalized to an arbitrary number of variables
![]() | (6) |
where Einstein summation has been used.
Let be a homogeneous function of order so that (1) Then define and . Then (2) (3) (4) Let , then (5) This can be generalized to an arbitrary number of variables (6) where Einstein summation has been used.

Let
be a homogeneous function of order
so that
![]() | (1) |
Then define
and
. Then
![]() | ![]() | (2) | |
![]() | (3) | ||
![]() | (4) |
Let
, then
![]() | (5) |
This can be generalized to an arbitrary number of variables
![]() | (6) |
where Einstein summation has been used.