A Short Note on Two-Loop Box Functions

It is shown that the two-loop four-point functions are similar in structure to the three-point two-loop functions for all mass cases and topologies. The result is derived by using a rotation to a (+,-,-,+) signature without spoiling analyticity properties.Comment: 7 pages, UTAS-PHYS-94-23, plain LATE

Three Etudes in QFT

We review QFT from the algebraic structure of its perturbative expansion and point out three new results.Comment: 6p, contribution to the Int. Congress Math. Phys., Prague 200