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D.15.12.45 derivationContractionGen
Procedure from library difform.lib (see difform_lib).
- Usage:
- derivationContractionGen(phi,d_gen); phi derivation, d_gen difform
- Assume:
- d_gen is a generator of the differential algebra
- Return:
- the image of d_gen under the contraction map i_phi
- Remarks:
- The formula for the contraction map applied to a generator of degree l is given by:
i_phi^(l)(dx_k*...*dx_j) = sum(i=1,..l)(-1)^(i+1) * phi(dx_i) * (dx_k*...*dx_j / dx_i)
- Note:
- this procedure should only be applied to generators
See also:
derivationContraction.
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