  The soft and collinear singularities of general scalar and tensor one-loop
N-point integrals are worked out explicitly. As a result a simple explicit
formula is given that expresses the singular part in terms of 3-point
integrals. Apart from predicting the singularities, this result can be used to
transfer singular one-loop integrals from one regularization scheme to another
or to subtract soft and collinear singularities from one-loop Feynman diagrams
directly in momentum space.
