[GiNaC-devel] RFC: step function and Pauli matrices

[Matthias Dellweg]

Dear all,
please consider the attached patches:

GiNaC is able to check whether expressions are sums of possymbols. We
can use that to evaluate some step functions immediately:
	0001-Evaluate-step-whenever-possible.patch
This should be a generic transformation from an integral with a step
function to step functions times integrals without:
	0002-Integrate-when-integrand-is-a-product-with-a-step-fu.patch
This patch implements Pauli matrices in the same manner as in color.cpp
(shamelessly borrowed...):
	0003-Implementation-of-Pauli-matrices.patch
As opposed to the color algebra, a product of pauli objects can always
be reduced to a linear combination of single pauli objects:
	0004-New-function-pauli_normalize.patch

Best wishes,
  Matthias Dellweg
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