B0[pp, ma^2, mb^2] is the Passarino - Veltman two-point integral B0. All arguments are scalars and have dimension mass^2. If the option BReduce is set to True certain B0's are reduced to A0's. Setting the option B0Unique to True simplifies B0[a,0,a] and B0[0,0,a].
See also: B1, B00, B11, PaVe.
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