2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155906The derivation of Feynman rules for unparticles carrying standard model quantum numbers is discussed. In particular, this note demonstrates that an application of Mandelstam's approach to constructing a gauge-invariant action reproduces for unparticles the vertices one obtains through the usual minimal coupling scheme; other non-trivial requirements are satisfied as well. This approach is compared to an alternative method 0801.0892 that has recently been constructed by A. L. Licht.7 pages, comment on arXiv:0801.0892; references addedHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext