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object --+ | list --+ | PhysicsObjectList --+ | DiagramList
List of Diagram objects
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Test if object obj is a valid Diagram for the list.
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This function returns a fitlered version of the diagram list self which satisfy the negative squared_order constraint 'order' with negative value 'value' and of type 'order_type', assuming that the diagram_list it must be squared against is 'reg_diag_list'. It also returns the new postive target squared order which correspond to this negative order constraint. Example: u u~ > d d~ QED^2<=-2 means that one wants to pick terms only up to the the next-to-leading order contributiong in QED, which is QED=2 in this case, so that target_order=4 is returned. |
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